A064378 a(0) = 2, a(n) = 2^(n+1)*(n-1)! (n >= 1).

2, 4, 8, 32, 192, 1536, 15360, 184320, 2580480, 41287680, 743178240, 14863564800, 326998425600, 7847962214400, 204047017574400, 5713316492083200, 171399494762496000, 5484783832399872000, 186482650301595648000, 6713375410857443328000

Offset: 0

Author

Anonymous, Sep 27 2001

Keywords

• nonn

Crossrefs

Cf. A032184.

Programs

Mathematica

Join[{2},Table[2^(n+1) (n-1)!,{n,20}]] (* Harvey P. Dale, Mar 12 2013 *)

Formula

E.g.f.: 2-2*log(1-2x).