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A309297 (1/5) times the sum of the elements of all subsets of [n] whose sum is divisible by five. 2
0, 0, 0, 1, 4, 12, 29, 71, 186, 468, 1144, 2718, 6390, 14920, 34440, 78720, 178320, 401088, 896576, 1992416, 4404288, 9689056, 21223216, 46305264, 100663680, 218104640, 471104880, 1014686160, 2179696352, 4670778048, 9985801344, 21303039648, 45354855072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (6,-12,8,0,6,-36,72,-48,0,-12,72,-144,96,0,8,-48,96,-64).

FORMULA

G.f.: -x^3*(8*x^13+16*x^10-12*x^9+16*x^6-6*x^5-9*x^4+3*x^3+2*x-1) / ((2*x-1)^3 *(2*x^5-1)^3).

CROSSREFS

Column k=5 of A309280.

Sequence in context: A062421 A036889 A036895 * A296645 A280007 A061726

Adjacent sequences:  A309294 A309295 A309296 * A309298 A309299 A309300

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Jul 21 2019

STATUS

approved

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Last modified October 27 09:08 EDT 2020. Contains 338035 sequences. (Running on oeis4.)