A013621 Triangle of coefficients in expansion of (2+5x)^n.

1, 2, 5, 4, 20, 25, 8, 60, 150, 125, 16, 160, 600, 1000, 625, 32, 400, 2000, 5000, 6250, 3125, 64, 960, 6000, 20000, 37500, 37500, 15625, 128, 2240, 16800, 70000, 175000, 262500, 218750, 78125, 256, 5120, 44800, 224000, 700000, 1400000

Offset: 0

Author

N. J. A. Sloane

Keywords

• tabl
• nonn
• easy

Formula

G.f.: 1 / [1 - x(2+5y)].