[seqfan] A009927 (was Re: "more" keyword)

israel at math.ubc.ca israel at math.ubc.ca
Fri Dec 18 18:51:32 CET 2015


I see that Neil has added "Needs a b-file" to A000927 and its partial sums
A265038.  

The gfun package suggests a G.f. for A000927:

-(12*x^14+8*x^13-7*x^12+16*x^11+51*x^10+182*x^9+327*x^8+418*x^7+450*x^6+350*x^5+243*x^4+130*x^3+51*x^2+12*x+1)/(x^12+x^10-2*x^9-x^8-2*x^7+2*x^5+x^4+2*x^3-x^2-1)

The denominator factors as
(x+1)*(x^2+1)^2*(x^2+x+1)^2*(x-1)^3

This does look like G.f.'s for other sequences of this type. Can someone 
confirm that this G.f. is correct? Otherwise I'll just call this an 
"empirical" g.f.

Cheers,
Robert



On Dec 17 2015, Neil Sloane wrote:

>well, no.  "more" officially means we need more terms to fill out three
>punched cards
>
>we really need a new keyword "bmore" (or "bore" if
>we want a 4-letter word)
>
>but we aren't adding new keywords these days.
>
>I suggest a simple comment line: "Needs a b-file"
>
>This is something I've thought of myself many times
>
>If we always use the same wording "Needs a b-file" then after a while
>folks will be able to do a search for it when they want to help
>
>Best regards
>Neil
>
>Neil J. A. Sloane, President, OEIS Foundation.
>11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
>Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
>Phone: 732 828 6098; home page: http://NeilSloane.com
>Email: njasloane at gmail.com
>
>
> On Thu, Dec 17, 2015 at 8:28 PM, Frank Adams-Watters 
> <franktaw at netscape.net> wrote:
>
>> Is it legitimate to use the "more" keyword when there are sufficient 
>> terms in the entry, but more terms are wanted for a b-file?
>>
>> Franklin T. Adams-Watters
>>
>>
>> _______________________________________________
>>
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>
>_______________________________________________
>
>Seqfan Mailing list - http://list.seqfan.eu/
>
>


More information about the SeqFan mailing list