A072043 a(n) = a(n-1)*a(n-2)*a(n-3)*(1+1/(n-3)), a(1)=a(2)=a(3)=1.

1, 1, 1, 2, 3, 8, 60, 1728, 967680, 114661785600, 215698302044209152000, 26592225368515593301597083402240000000, 723457119656730571214801208759677424070060705650559470796800000000000

Offset

1,4

Links

Table of n, a(n) for n=1..13.

Mathematica

a[1] = a[2] = a[3] = 1; a[n_] := a[n - 1]*a[n - 2]*a[n - 3]*(1 + 1/(n - 3)); Table[ a[n], {n, 1, 13}]

Crossrefs

Sequence in context: A042365 A329496 A160634 * A347289 A095203 A351658

Adjacent sequences: A072040 A072041 A072042 * A072044 A072045 A072046

Keyword

easy,nonn

Author

Benoit Cloitre, Jul 29 2002

Extensions

Edited by Robert G. Wilson v, Jul 31 2002

a(11) corrected by Sean A. Irvine, Aug 27 2024

Status

approved