A372995 a(n) = n! / (a(n-1) a(n-2) a(n-3)), where a(0) = a(1) = a(2) = 1.

1, 1, 1, 6, 4, 5, 6, 42, 32, 45, 60, 462, 384, 585, 840, 6930, 6144, 9945, 15120, 131670, 122880, 208845, 332640, 3028410, 2949120, 5221125, 8648640, 81767070, 82575360, 151412625, 259459200, 2534779170, 2642411520, 4996616625, 8821612800, 88717270950

Offset

0,4

Links

Table of n, a(n) for n=0..35.

Mathematica

a[0] = 1; a[1] = 1; a[2] = 1;
a[n_] := a[n] = n!/(a[n - 1]*a[n - 2]*a[n - 3]);
Table[a[n], {n, 0, 40}]

Crossrefs

Cf. A000142, A007661.

Sequence in context: A140246 A130786 A197295 * A199385 A177159 A361605

Adjacent sequences: A372992 A372993 A372994 * A372996 A372997 A372998

Keyword

nonn

Author

Clark Kimberling, Jul 16 2024

Status

approved