A082427 a(1)=1, a(n)=n*(a(n-1)+a(n-2)+...+a(2)+a(1)) - 2.

1, 0, 1, 6, 38, 274, 2238, 20462, 207178, 2301978, 27853934, 364633318, 5135252562, 77423807858, 1244311197718, 21236244441054, 383579665216538, 7310577148832842, 146617686151591998, 3086688129507199958

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Formula

for n>=2 a(n) = floor(n*(11/2-2e)*n!)

Mathematica

Join[{1}, Table[Floor[n(11/2-2E)n!], {n, 2, 20}]] (* Harvey P. Dale, May 09 2013 *)

Crossrefs

Cf. A007808, A074143.

Sequence in context: A098410 A079949 A026940 * A192941 A263855 A354326

Adjacent sequences: A082424 A082425 A082426 * A082428 A082429 A082430

Keyword

nonn

Author

Benoit Cloitre, Apr 24 2003

Status

approved