A067819 Sum of the divisors of binomial(2n,n).

3, 12, 42, 144, 728, 2688, 10080, 39312, 127008, 423360, 2419200, 6773760, 32140800, 160704000, 626745600, 1940889600, 9289728000, 38397542400, 156332851200, 642477588480, 2223960883200, 8154523238400, 36280077926400

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..1662

Formula

a(n) = A000203(A000984(n)). - Amiram Eldar, Sep 28 2019

Mathematica

Table[DivisorSigma[1, Binomial[2 n, n]], {n, 30}]

Prog

(PARI) a(n) = sigma(binomial(2*n, n)); \\ Michel Marcus, Sep 28 2019

Crossrefs

Cf. A000203, A000984, A048784.

Sequence in context: A084529 A017941 A066972 * A094970 A065179 A048121

Adjacent sequences: A067816 A067817 A067818 * A067820 A067821 A067822

Keyword

nonn

Author

Joseph L. Pe, Feb 08 2002

Status

approved