This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A136468 #2 Mar 30 2012 18:37:08
%S A136468 1,2,8,106,4728,697288,341056672,561635549128,3172355531357504,
%T A136468 62573893999774791616,4377792727679018712191744,
%U A136468 1100465546170585425117622597248,1004426091768772936789017838438890496
%N A136468 Column 1 of triangle A136467 (scaled): a(n) = A136467(n+1,1)/2^n.
%o A136468 (PARI) {a(n)=local(M=matrix(n+2,n+2,r,c,binomial(r*2^(c-2),c-1)),P); P=matrix(n+2,n+2,r,c,binomial((r+1)*2^(c-2),c-1));(P~*M~^-1)[n+2,2]/2^n}
%Y A136468 Cf. A136467; A136469.
%K A136468 nonn
%O A136468 0,2
%A A136468 _Paul D. Hanna_, Dec 31 2007