A013621 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..41.

FORMULA

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

CROSSREFS

Sequence in context: A065160 A255544 A019152 * A107732 A349475 A111364

Adjacent sequences: A013618 A013619 A013620 * A013622 A013623 A013624

KEYWORD

tabl,nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved