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A154913
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Triangle T(n,m,p,q) = (p^(n-k)*q^k + p^k*q^(n-k))*(StirlingS1(n, k) + StirlingS1(n, n-k)) with p=2 and q=1, read by rows.
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5
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4, 3, 3, 5, -8, 5, 9, -6, -6, 9, 17, -120, 176, -120, 17, 33, 252, -180, -180, 252, 33, 65, -4590, 7180, -7200, 7180, -4590, 65, 129, 46134, -57204, 21336, 21336, -57204, 46134, 129, 257, -658840, 910520, -603680, 433216, -603680, 910520, -658840, 257
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OFFSET
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0,1
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LINKS
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FORMULA
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T(n,m,p,q) = (p^(n-k)*q^k + p^k*q^(n-k))*(StirlingS1(n, k) + StirlingS1(n, n-k)) with p=2 and q=1.
Sum_{k=0..n} T(n,k,p,q) = 2*(-p)^n*Pochhammer(-q/p, n) + p^(n+1)*[n < 2], where p=2 and q=1. - G. C. Greubel, Mar 02 2021
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EXAMPLE
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Triangle begins as:
4;
3, 3;
5, -8, 5;
9, -6, -6, 9;
17, -120, 176, -120, 17;
33, 252, -180, -180, 252, 33;
65, -4590, 7180, -7200, 7180, -4590, 65;
129, 46134, -57204, 21336, 21336, -57204, 46134, 129;
257, -658840, 910520, -603680, 433216, -603680, 910520, -658840, 257;
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MAPLE
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A154913:= (n, k, p, q) -> (p^(n-k)*q^k + p^k*q^(n-k))*(Stirling1(n, k) + Stirling1(n, n-k));
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MATHEMATICA
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T[n_, k_, p_, q_]:= (p^(n-k)*q^k + p^k*q^(n-k))*(StirlingS1[n, k] + StirlingS1[n, n-k]);
Table[T[n, k, 2, 1], {n, 0, 12}, {k, 0, n}]//Flatten (* modified by G. C. Greubel, Mar 02 2021 *)
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PROG
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(Sage)
def A154913(n, k, p, q): return (p^(n-k)*q^k + p^k*q^(n-k))*(stirling_number1(n, k) + stirling_number1(n, n-k))
(Magma)
A154913:= func< n, k, p, q | (p^(n-k)*q^k + p^k*q^(n-k))*(StirlingFirst(n, k) + StirlingFirst(n, n-k)) >;
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CROSSREFS
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Cf. this sequence (q=1), A154914 (q=3).
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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