[seqfan] Re: seq needed of (0,+-1) matrices

Ron Hardin rhhardin at att.net
Fri Jan 20 11:18:59 CET 2012


Probably final results
 1 3 27 293 3605 52327 899311 18019017
 1 3 27 125 461 1583 5335 17881 59641 197691 650739 2127381 6910853

 rhhardin at mindspring.com
rhhardin at att.net (either)



----- Original Message ----
> From: Ron Hardin <rhhardin at att.net>
> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> Sent: Thu, January 19, 2012 5:19:36 PM
> Subject: [seqfan] Re: seq needed of (0,+-1) matrices
> 
> The other series starts
> 1 3 27 125 461 1583 5335 17881
> 
> 
> rhhardin at mindspring.com
> rhhardin at att.net (either)
> 
> 
> 
> ----- Original Message ----
> > From: N. J. A.  Sloane <njas at research.att.com>
> > To: seqfan at list.seqfan.eu
> > Cc: rhhardin at mindspring.com; njas at research.att.com
> > Sent: Thu,  January 19, 2012 4:41:46 PM
> > Subject: [seqfan] Re: seq needed of (0,+-1)  matrices
> > 
> > Robert Israel found the explanation!
> > I was  using 
> > 
>>star:=A[w,x]*A[y,z]+A[w,y]*A[x,z]+A[w,z]*A[x,y]-A[w,x]*A[w,y]*A[w,z]*A[x,y]*A[x,z]*A[y,z];
>;
> >;
> > 
> > and  got a(4) = 125, agreeing with Max A.,
> > 
> > but  when I corrected this to 
> > 
>>star:=A[w,x]*A[y,z]+A[w,y]*A[z,x]+A[w,z]*A[x,y]-A[w,x]*A[w,y]*A[w,z]*A[x,y]*A[x,z]*A[y,z];
>;
> >;
> > 
> > I  get a(4) = 293, agreeing with rhh.
> > 
> > So it does  look like we get two  sequences!
> > 
> > The second version is the  one in Wesp's paper (although
> > he  does not give any numerical  values)
> > 
> > Robert, thanks for straightening this   out!
> > 
> > I will add the other version - it will be A204821 (and 
> > A204809  is the other  version)
> > 
> > Neil
> > 
> > 
> > _______________________________________________
> > 
> > Seqfan  Mailing list - http://list.seqfan.eu/
> > 
> 
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> 
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> 



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