A065345 a(n) = binomial(2*n,n) mod ((n+1)*(n+2)*(n+3)).

2, 6, 20, 70, 252, 420, 552, 0, 1100, 1144, 0, 1456, 1400, 2040, 2448, 0, 3420, 0, 0, 0, 6072, 5520, 0, 5850, 13104, 0, 12992, 17980, 22320, 27280, 5984, 7854, 7140, 15540, 0, 36556, 13832, 0, 45920, 24682, 0, 0, 0, 0, 51888, 0, 23520, 0, 0, 0, 0, 94446, 0, 0, 0

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

C. Pomerance, Divisors of the middle binomial coefficient, Amer. Math. Monthly, 112 (2015), 636-644.

Mathematica

Table[Mod[Binomial[2 n, n], (n + 1) (n + 2) (n + 3)], {n, 60}] (* Harvey P. Dale, Feb 21 2012 *)

Prog

(PARI) a(n) = { binomial(2*n, n) % ((n + 1)*(n + 2)*(n + 3)) } \\ Harry J. Smith, Oct 17 2009

Crossrefs

Cf. A000108, A065344, A065346, A065347, A065348, A065349.

Sequence in context: A150125 A360295 A224514 * A130914 A302644 A087944

Adjacent sequences: A065342 A065343 A065344 * A065346 A065347 A065348

Keyword

nonn

Author

Labos Elemer, Oct 30 2001

Status

approved