A030814 a(n) = floor(exp(15/23) * n!).

1, 3, 11, 46, 230, 1382, 9675, 77402, 696624, 6966242, 76628663, 919543959, 11954071471, 167357000594, 2510355008911, 40165680142590, 682816562424042, 12290698123632756, 233523264349022367, 4670465286980447352

Offset

1,2

Links

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

Example

15/23 = 0.65217391304347826...
e^(15/23) = 1.91970957781434403430534711... so a(1) = 1.
e^(15/23) * 2! = 3.83941915562868806861... so a(2) = 3.
e^(15/23) * 3! = 11.518257466886064205832... so a(3) = 11.

Mathematica

Floor[Exp[15/23] Range[20]!] (* Harvey P. Dale, Feb 11 2015 *)

Crossrefs

Cf. A021027 (1/23).

Sequence in context: A248426 A337913 A129579 * A030976 A264416 A290712

Adjacent sequences: A030811 A030812 A030813 * A030815 A030816 A030817

Keyword

nonn,easy

Author

Simon Plouffe

Status

approved