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Sum of the divisors of binomial(2n,n).
3

%I #12 Sep 28 2019 06:08:27

%S 3,12,42,144,728,2688,10080,39312,127008,423360,2419200,6773760,

%T 32140800,160704000,626745600,1940889600,9289728000,38397542400,

%U 156332851200,642477588480,2223960883200,8154523238400,36280077926400

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

%H Amiram Eldar, <a href="/A067819/b067819.txt">Table of n, a(n) for n = 1..1662</a>

%F a(n) = A000203(A000984(n)). - _Amiram Eldar_, Sep 28 2019

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

%o (PARI) a(n) = sigma(binomial(2*n,n)); \\ _Michel Marcus_, Sep 28 2019

%Y Cf. A000203, A000984, A048784.

%K nonn

%O 1,1

%A _Joseph L. Pe_, Feb 08 2002