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A005017
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Denominator of (binomial(2*n-2,n-1)/n!)^2.
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3
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1, 1, 1, 36, 144, 400, 3600, 2822400, 16257024, 32920473600, 823011840000, 8129341440000, 292656291840000, 3877578804363264, 58642395498086400, 844450495172444160000, 54044831691036426240000
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OFFSET
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1,4
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REFERENCES
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Valtr, Pavel; The probability that $n$ random points in a triangle are in convex position. Combinatorica 16 (1996), no. 4, 567-573.
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LINKS
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Table of n, a(n) for n=1..17.
Eric Weisstein's World of Mathematics, Sylvester's Four-Point Problem.
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MATHEMATICA
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Denominator[Table[(Binomial[2n-2, n-1]/n!)^2, {n, 20}]] (* Harvey P. Dale, May 30 2012 *)
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CROSSREFS
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Sequence in context: A204106 A049227 A016910 * A288488 A262789 A110754
Adjacent sequences: A005014 A005015 A005016 * A005018 A005019 A005020
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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