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

0,1

Links

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

Formula

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

Mathematica

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

Crossrefs

Cf. A032184.

Sequence in context: A074406 A186340 A228920 * A191650 A036544 A094334

Adjacent sequences: A064375 A064376 A064377 * A064379 A064380 A064381

Keyword

nonn

Author

Anonymous, Sep 27 2001

Status

approved