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A167172
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Triangle T(n,k) read by rows: T(n,k) = binomial(n, k) + A140356(n, k) - 1.
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1
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1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 7, 4, 1, 1, 5, 11, 11, 5, 1, 1, 6, 16, 25, 16, 6, 1, 1, 7, 22, 40, 40, 22, 7, 1, 1, 8, 29, 61, 93, 61, 29, 8, 1, 1, 9, 37, 89, 149, 149, 89, 37, 9, 1, 1, 10, 46, 125, 233, 371, 233, 125, 46, 10, 1
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OFFSET
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0,5
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COMMENTS
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Row sums are: {1, 2, 4, 8, 17, 34, 71, 140, 291, 570, 1201,...}.
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LINKS
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FORMULA
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T(n,k) = binomial(n, k) + A140356(n, k) - 1 = binomial(n, k) + if(k less than equal floor(n/2), Gamma(k + 1), Gamma(n - k + 1)) - 1.
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EXAMPLE
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{1},
{1, 1},
{1, 2, 1},
{1, 3, 3, 1},
{1, 4, 7, 4, 1},
{1, 5, 11, 11, 5, 1},
{1, 6, 16, 25, 16, 6, 1},
{1, 7, 22, 40, 40, 22, 7, 1},
{1, 8, 29, 61, 93, 61, 29, 8, 1},
{1, 9, 37, 89, 149, 149, 89, 37, 9, 1},
{1, 10, 46, 125, 233, 371, 233, 125, 46, 10, 1}.
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MATHEMATICA
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t[n_, k_] = Binomial[n, k] + If[k <= Floor[n/2], Gamma[k + 1], Gamma[n - k + 1]] - 1; Flatten[Table[Table[t[n, k], {k, 0, n}], {n, 0, 10}]]
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Edited by the OEIS editors, Jun 05 2016
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STATUS
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approved
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