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

1, 1, 2, 3, 8, 40326

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

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

Crossrefs

A114020 is an essentially identical sequence.

Programs

Mathematica

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