A013623 Triangle of coefficients in expansion of (2+7x)^n.

1, 2, 7, 4, 28, 49, 8, 84, 294, 343, 16, 224, 1176, 2744, 2401, 32, 560, 3920, 13720, 24010, 16807, 64, 1344, 11760, 54880, 144060, 201684, 117649, 128, 3136, 32928, 192080, 672280, 1411788, 1647086, 823543, 256, 7168, 87808, 614656

Offset

0,2

Links

Table of n, a(n) for n=0..39.

Formula

G.f.: 1 / [1 - x(2+7y)].

Crossrefs

Sequence in context: A054787 A190716 A303384 * A345273 A348145 A210421

Adjacent sequences: A013620 A013621 A013622 * A013624 A013625 A013626

Keyword

tabl,nonn,easy

Author

N. J. A. Sloane.

Status

approved