[seqfan] Re: Permutations with 2K-2 odd displacements, formula?

[Ron Hardin]

Great!  so the formula in my n,k terms checks as
T(n,k)=factorial(n/2)*factorial((n+1)/2)*binomial(n/2,k-1)*binomial((n+1)/2,k-1);


 
with integer (floor) divides.

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



----- Original Message ----
> From: Neil Sloane <njasloane at gmail.com>
> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> Sent: Sat, June 1, 2013 10:36:46 PM
> Subject: [seqfan] Re: Permutations with 2K-2 odd displacements, formula?
> 
> In fact, after dividing by the entries at the start of the rows,
> we seem to  get A124428