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A005017 Denominator of (binomial(2*n-2,n-1)/n!)^2. 3
1, 1, 1, 36, 144, 400, 3600, 2822400, 16257024, 32920473600, 823011840000, 8129341440000, 292656291840000, 3877578804363264, 58642395498086400, 844450495172444160000, 54044831691036426240000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

Valtr, Pavel; The probability that $n$ random points in a triangle are in convex position. Combinatorica 16 (1996), no. 4, 567-573.

LINKS

Table of n, a(n) for n=1..17.

Eric Weisstein's World of Mathematics, Sylvester's Four-Point Problem.

MATHEMATICA

Denominator[Table[(Binomial[2n-2, n-1]/n!)^2, {n, 20}]] (* Harvey P. Dale, May 30 2012 *)

CROSSREFS

Sequence in context: A204106 A049227 A016910 * A288488 A262789 A110754

Adjacent sequences:  A005014 A005015 A005016 * A005018 A005019 A005020

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 21 12:28 EST 2019. Contains 329370 sequences. (Running on oeis4.)