A051399 a(n) = (n-1)!*a(n-1)+1.

0, 1, 2, 5, 31, 745, 89401, 64368721, 324418353841, 13080548026869121, 4746669267990266628481, 17224713439683079541431852801, 687555441429141549439426981886956801, 329340156533265088807964627407023326809881601

Offset: 0

Author

Aleksandar Petojevic

Keywords

• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..44

Programs

Mathematica

nxt[{n_,a_}]:={n+1,n!*a+1}; NestList[nxt,{0,0},15][[All,2]] (* Harvey P. Dale, May 29 2017 *)