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A110129
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Central coefficients of a scaled Legendre triangle.
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6
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1, 2, 22, 504, 16966, 752800, 41492284, 2734083968, 209681631814, 18348172005888, 1804161160185748, 196945525458761728, 23633625832975567644, 3092337510752711057408, 438161926888980929318584
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OFFSET
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0,2
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COMMENTS
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Central coefficients of triangle A110124.
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LINKS
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FORMULA
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a(n)=2^n*LegendreP(n, n); a(n)=sum{j=0..floor(n/2), (-1)^j*C(n, j)C(2n-2j, n)n^(n-2j).
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MATHEMATICA
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Table[2^n LegendreP[n, n], {n, 0, 20}] (* Harvey P. Dale, Nov 28 2012 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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