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A121429
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Main diagonal of rectangular table A121428.
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2
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1, 2, 18, 250, 4520, 99351, 2556806, 75190410, 2483617140, 90955908010, 3655774038653, 159938142409890, 7564604603286913, 384576889110665055, 20912407157570989950, 1211142337261176799610, 74427504634177621877538
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = [A121412^(n+1)](n+2,2) for n>=0; i.e., the (n+1)-th term of column 2 in matrix power A121412^(n+1).
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PROG
| (PARI) {a(n)=local(H=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]=(H^i)[i-1, j]); )); H=B); return((H^(n+1))[n+3, 3])}
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CROSSREFS
| Cf. A121428, A121412.
Sequence in context: A168562 A117514 A138437 * A109517 A143138 A151362
Adjacent sequences: A121426 A121427 A121428 * A121430 A121431 A121432
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Aug 26 2006
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