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Search: id:A121418
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A121418 Column 0 of triangle A121416. +0
8
1, 2, 7, 43, 403, 5188, 85569, 1725291, 41145705, 1133047596, 35377360292, 1234796503280, 47636225803285, 2012509471127885, 92398547122062997, 4580472438441602301, 243822925502110419105, 13870297863425823346284 (list; graph; listen)
OFFSET

0,2

COMMENT

A121416 is the matrix square of triangle A121412; row n of triangle T=A121412 equals row (n-1) of T^(n+1) with an appended '1'.

PROGRAM

(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)[i-1, j]); )); A=B); return((A^2)[n+1, 1])}

CROSSREFS

Cf. A121416 (triangle); other columns: A121418, A121419.

Sequence in context: A050631 A078676 A086331 this_sequence A136734 A014501 A011835

Adjacent sequences: A121415 A121416 A121417 this_sequence A121419 A121420 A121421

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Aug 22 2006

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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