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A068031 Number of subsets of {1,2,3,...,n} that sum to 0 mod 10. 2
1, 1, 1, 1, 2, 4, 7, 13, 26, 52, 104, 206, 410, 820, 1640, 3280, 6556, 13108, 26216, 52432, 104864, 209720, 419432, 838864, 1677728, 3355456, 6710896, 13421776, 26843552, 53687104, 107374208, 214748384, 429496736, 858993472, 1717986944 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..34.

FORMULA

Empirical G.f.: (x-1)*(2*x^7+3*x^6+4*x^5+2*x^4+2*x^3+x^2-1) / ((2*x-1)*(2*x^5-1)). [Colin Barker, Dec 22 2012]

CROSSREFS

10th row of A068009.

Sequence in context: A303059 A099155 A262267 * A293314 A023431 A025246

Adjacent sequences:  A068028 A068029 A068030 * A068032 A068033 A068034

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 11 2002

STATUS

approved

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Last modified November 20 05:07 EST 2019. Contains 329323 sequences. (Running on oeis4.)