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Search: id:A121396
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| A121396 |
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Column 1 of triangle T=A121395, where column k of T equals column k of T^(2^k) shift down 1 row. |
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+0
3
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| 1, 1, 2, 5, 16, 75, 594, 8420, 212790, 9542280, 763184598, 109735708579, 28582820337914, 13580038203578493, 11845224434439055236, 19084161956327789507755, 57113015617717986294647190
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Also equals column 1 of the matrix square of triangle A121395.
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^(2^(j-1)))[i-1, j]); )); A=B); return(A[n+2, 2])}
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CROSSREFS
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Cf. A121395 (triangle), A121397 (column 2).
Sequence in context: A078639 A002632 A020127 this_sequence A054960 A004110 A048754
Adjacent sequences: A121393 A121394 A121395 this_sequence A121397 A121398 A121399
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jul 27 2006
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