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A216182
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Riordan array ((1+x)/(1-x)^2, x(1+x)^2/(1-x)^2).
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3
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1, 3, 1, 5, 7, 1, 7, 25, 11, 1, 9, 63, 61, 15, 1, 11, 129, 231, 113, 19, 1, 13, 231, 681, 575, 181, 23, 1, 15, 377, 1683, 2241, 1159, 265, 27, 1, 17, 575, 3653, 7183, 5641, 2047, 365, 31, 1, 19, 833, 7183, 19825, 22363, 11969, 3303, 481, 35, 1
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OFFSET
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0,2
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COMMENTS
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Triangle formed of odd-numbered columns of the Delannoy triangle A008288.
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LINKS
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FORMULA
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Sum_{k=0..n} T(n,k) = A073717(n+1).
T(n, k) = hypergeometric([-n+k, -2*k-1], [1], 2). (End)
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EXAMPLE
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Triangle begins
1;
3, 1;
5, 7, 1;
7, 25, 11, 1;
9, 63, 61, 15, 1;
11, 129, 231, 113, 19, 1;
13, 231, 681, 575, 181, 23, 1;
15, 377, 1683, 2241, 1159, 265, 27, 1;
17, 575, 3653, 7183, 5641, 2047, 365, 31, 1;
...
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MATHEMATICA
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A216182[n_, k_]:= Hypergeometric2F1[-n +k, -2*k-1, 1, 2];
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PROG
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(Sage)
def A216182(n, k): return simplify( hypergeometric([-n+k, -2*k-1], [1], 2) )
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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