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A132694
Column 3 of triangle A132690.
4
1, 1, -4, 35, -455, 7735, -161336, 3973212, -112587210, 3603324835, -128433778935, 5042279130343, -216113991649920, 10038333251577820, -502213976534135280, 26920671954736535620, -1539171664433009622090, 93492751831594011076131, -6012423991038631627857900
OFFSET
0,3
COMMENTS
Triangle T=A132690 is generated from negative powers of itself such that row n+1 of T = row n of T^(-n) with appended '1' for n>=0 with T(0,0)=1.
PROG
(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+4, 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+4, 4]))}
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Aug 25 2007
STATUS
approved