A204292 Binomial(n, d(n)), where d(n) = A000005(n) is the number of divisors of n.

1, 1, 3, 4, 10, 15, 21, 70, 84, 210, 55, 924, 78, 1001, 1365, 4368, 136, 18564, 171, 38760, 5985, 7315, 253, 735471, 2300, 14950, 17550, 376740, 406, 5852925, 465, 906192, 40920, 46376, 52360, 94143280, 666, 73815, 82251, 76904685, 820, 118030185, 903, 7059052, 8145060

Offset

1,3

Links

Table of n, a(n) for n=1..45.

Mathematica

Table[Binomial[n, DivisorSigma[0, n]], {n, 1, 50}] (* Vaclav Kotesovec, May 08 2021 *)

Prog

(PARI) vector(60, n, binomial(n, numdiv(n)))

Crossrefs

Cf. A000005, A066449, A068904.

Sequence in context: A347568 A048155 A242342 * A218277 A103080 A055720

Adjacent sequences: A204289 A204290 A204291 * A204293 A204294 A204295

Keyword

nonn

Author

Franklin T. Adams-Watters, Jan 14 2012

Status

approved