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A086954
Binomial transform of A061800.
0
1, 1, 4, 14, 38, 92, 214, 490, 1108, 2474, 5462, 11948, 25942, 55978, 120148, 256682, 546134, 1157804, 2446678, 5155498, 10835284, 22719146, 47535446, 99265196, 206918998, 430615210, 894784852, 1856678570, 3847574870, 7963585196
OFFSET
0,3
FORMULA
a(n)=0^n+n2^(n-1)+sum{k=0..floor((n-1)/3) C(n-1, 3k+2) }
O.g.f.: (1-x)(1-3x+5x^2)/[(1-x+x^2)(-1+2x)^2]. - R. J. Mathar, Apr 02 2008
CROSSREFS
Sequence in context: A316878 A036368 A006071 * A111583 A124615 A317606
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jul 25 2003
STATUS
approved