|
%I #2 Mar 30 2012 18:37:08
%S 1,4,36,972,82692,22668224,20480767016,62399482333360,
%T 654732295896172624,24092174555680443592896,
%U 3156168229958886081384337440,1490220874303979634022445823087616
%N Column 2 of triangle A136467 (scaled): a(n) = A136467(n+2,2)/4^n.
%o (PARI) {a(n)=local(M=matrix(n+3,n+3,r,c,binomial(r*2^(c-2),c-1)),P); P=matrix(n+3,n+3,r,c,binomial((r+1)*2^(c-2),c-1));(P~*M~^-1)[n+3,3]/4^n}
%Y Cf. A136467; A136468.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Dec 31 2007
|
