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A136469 Column 2 of triangle A136467 (scaled): a(n) = A136467(n+2,2)/4^n. 2

%I

%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

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)