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Column 0 of triangle A132690.
4

%I #2 Mar 30 2012 18:37:04

%S 1,1,-1,5,-43,527,-8396,164672,-3835910,103464895,-3170985454,

%T 108828369497,-4134333957073,172223139437835,-7805591781504739,

%U 382374360671653989,-20132511625986242785,1133765691312312723347,-68002260363248096548050

%N Column 0 of triangle A132690.

%o (PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^(-(i-2)))[i-1, j]); )); A=B); return( ((A)[n+1,1]))}

%Y Cf. A132690; A132692, A132693, A132694.

%K sign

%O 0,4

%A _Paul D. Hanna_, Aug 25 2007