A132691 Column 0 of triangle A132690.

1, 1, -1, 5, -43, 527, -8396, 164672, -3835910, 103464895, -3170985454, 108828369497, -4134333957073, 172223139437835, -7805591781504739, 382374360671653989, -20132511625986242785, 1133765691312312723347, -68002260363248096548050

Offset

0,4

Links

Table of n, a(n) for n=0..18.

Prog

(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]))}

Crossrefs

Cf. A132690; A132692, A132693, A132694.

Sequence in context: A360618 A060053 A227176 * A256033 A251568 A090470

Adjacent sequences: A132688 A132689 A132690 * A132692 A132693 A132694

Keyword

sign

Author

Paul D. Hanna, Aug 25 2007

Status

approved