A179539 a(0)=1, a(1)=0, a(n)=2n(a(n-1)+a(n-2)), n>1.

1, 0, 4, 24, 224, 2480, 32448, 488922, 8343040, 158976576, 3346392320, 77118115712, 1931148192768, 52214924020480, 1516090021970944, 47049148379742720

Offset

0,3

Links

Table of n, a(n) for n=0..15.

Example

a(2)= 4*(0+1)=4, a(3)=6*(4+0)=24, a(4)=8*(24+4)=224...

Crossrefs

Sequence in context: A183279 A145237 A034256 * A277612 A216857 A318005

Adjacent sequences: A179536 A179537 A179538 * A179540 A179541 A179542

Keyword

nonn

Author

Gary Detlefs, Jul 18 2010

Extensions

Definition corrected by Bruno Berselli, Jul 20 2010

Status

approved