A094547 A019309(n)/4 for n >= 1.

1, 3, 12, 45, 180, 708, 2832, 11283, 45132, 180348, 721392, 2884860, 11539440, 46154928, 184619712, 738467565, 2953870260, 11815435908, 47261743632, 189046794180, 756187176720, 3024747985488, 12098991941952, 48395964882948

Offset: 1

Author

N. J. A. Sloane, Jun 06 2004

Keywords

• nonn
• easy

Formula

a(2n+1) = 4*a(2n); a(2n) = 4*a(2n-1)-a(n). - David Wasserman, May 22 2007

Extensions

More terms from David Wasserman, May 22 2007