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

Author

Joseph L. Pe, Feb 08 2002

Keywords

• nonn

Links

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

Crossrefs

Cf. A000203, A000984, A048784.

Programs

Mathematica

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

PARI

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

Formula

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