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A068012 Number of subsets of {1,2,3,...,n} that sum to 0 mod 6. 1
1, 1, 1, 2, 3, 6, 12, 22, 44, 88, 172, 344, 688, 1368, 2736, 5472, 10928, 21856, 43712, 87392, 174784, 349568, 699072, 1398144, 2796288, 5592448, 11184896, 22369792, 44739328, 89478656, 178957312, 357914112, 715828224, 1431656448, 2863311872 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

FORMULA

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

CROSSREFS

6th row of A068009.

Sequence in context: A018079 A289920 A060985 * A261930 A019138 A154324

Adjacent sequences:  A068009 A068010 A068011 * A068013 A068014 A068015

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 11 2002

STATUS

approved

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Last modified January 27 16:19 EST 2022. Contains 350608 sequences. (Running on oeis4.)