A005604 a(n) = a(n-1)! + a(n-2)!.

1, 1, 2, 3, 8, 40326

Offset

0,3

Comments

The next term has 168215 decimal digits. - Rick L. Shepherd, Nov 04 2004

Links

Table of n, a(n) for n=0..5.

Mathematica

nxt[{a_, b_}]:={b, a!+b!}; NestList[nxt, {1, 1}, 5][[All, 1]] (* Harvey P. Dale, Aug 12 2020 *)

Crossrefs

A114020 is an essentially identical sequence.

Sequence in context: A336292 A285088 A075849 * A114020 A011163 A155983

Adjacent sequences: A005601 A005602 A005603 * A005605 A005606 A005607

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved