A025959 Expansion of 1/((1-2x)(1-4x)(1-5x)(1-7x)).

1, 18, 209, 1998, 17157, 137970, 1063273, 7962966, 58471853, 423482202, 3037367697, 21634921854, 153344743189, 1083048862914, 7630057197881, 53656123623462, 376830071424765, 2644030889883306, 18539455617424225

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (18, -115, 306, -280).

Formula

a(n) = -4*2^n/15 +32*4^n/3 -125*5^n/6 +343*7^n/30. - R. J. Mathar, Jun 20 2013

Crossrefs

Sequence in context: A055528 A304202 A298988 * A229270 A261484 A004323

Adjacent sequences: A025956 A025957 A025958 * A025960 A025961 A025962

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved