A030811 a(n) = floor(exp(18/23) * n!).

2, 4, 13, 52, 262, 1574, 11023, 88186, 793680, 7936804, 87304847, 1047658165, 13619556146, 190673786051, 2860106790769, 45761708652310, 777949047089272, 14003082847606913, 266058574104531353, 5321171482090627067

Offset

1,1

Links

Table of n, a(n) for n=1..20.

Mathematica

Floor[Exp[18/23] Range[20]!] (* Harvey P. Dale, May 02 2018 *)

Crossrefs

Sequence in context: A330344 A161905 A030953 * A030917 A030863 A030800

Adjacent sequences: A030808 A030809 A030810 * A030812 A030813 A030814

Keyword

nonn

Author

Simon Plouffe

Status

approved