A038244 Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*2^j.

1, 5, 2, 25, 20, 4, 125, 150, 60, 8, 625, 1000, 600, 160, 16, 3125, 6250, 5000, 2000, 400, 32, 15625, 37500, 37500, 20000, 6000, 960, 64, 78125, 218750, 262500, 175000, 70000, 16800, 2240, 128, 390625, 1250000, 1750000, 1400000, 700000

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• tabl
• easy

Links

• B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

Formula

G.f.: 1/(1 - 5*x - 2*x*y). - Ilya Gutkovskiy, Apr 21 2017