A067819 - OEIS

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A067819

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

3

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

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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