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Search: id:A096078
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| A096078 |
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Triangle read by rows: T(n,k) = (k+1)T(n-1,k)+(n-k+1)T(n,k-1). |
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1
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| 1, 1, 1, 1, 4, 4, 1, 11, 34, 34, 1, 26, 180, 496, 496, 1, 57, 768, 4288, 11056, 11056, 1, 120, 2904, 28768, 141584, 349504, 349504, 1, 247, 10194, 166042, 1372088, 6213288, 14873104, 14873104, 1, 502, 34096, 868744, 11204160, 82096368, 350400832
(list; table; graph; listen)
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OFFSET
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0,5
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FORMULA
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T(n-1, 1) given by Eulerian numbers, 2^n - n - 1 (A000295). T(n-1, n-1) given by 2^n*(2^{2n} - 1)*|B_{2n}|/n, B_n = Bernoulli numbers (A002105).
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EXAMPLE
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Table begins:
1
1 1
1 4 4
1 11 34 34
1 26 180 496 496
1 57 768 4288 11056 11056
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MATHEMATICA
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T[n_, 0] := 1; T[n_, 1] := 2^(n+1) - n - 2; T[n_, n_] := 2^(n+1)*(2^(2n+2) - 1)*Abs[ BernoulliB[2n + 2]]/ (n + 1); T[n_, k_] := (j + 1)T[n - 1, j] + (n - j + 1)T[n, j - 1]); Flatten[ Table[ T[n, k], {n, 0, 8}, {k, 0, n}]] (from Robert G. Wilson v Jul 23 2004)
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CROSSREFS
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Cf. A000295, A002105.
Sequence in context: A080721 A123588 A106026 this_sequence A140313 A102323 A145902
Adjacent sequences: A096075 A096076 A096077 this_sequence A096079 A096080 A096081
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Boddington (psb(AT)maths.warwick.ac.uk), Jul 22 2004
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 23 2004
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