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A121419
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Column 2 of triangle A121416.
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4
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1, 2, 11, 101, 1305, 21745, 443329, 10679494, 296547736, 9319259500, 326788327650, 12643827604842, 534889691765631, 24555735428777265, 1215611513578215355, 64542477563559758310, 3658333757447085090365
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OFFSET
| 0,2
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COMMENTS
| 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'.
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PROG
| (PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+3, 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+3, 3])}
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CROSSREFS
| Cf. A121416 (triangle); other columns: A121417, A121418.
Sequence in context: A089770 A199302 A069663 * A099701 A089393 A069664
Adjacent sequences: A121416 A121417 A121418 * A121420 A121421 A121422
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Aug 22 2006
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