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%I
%S 0,1,3,13,45,151,483,1513,4665,14251,43263,130813,394485,1187551,
%T 3570843,10728913,32219505,96724051,290303223,871171813,2614039725,
%U 7843167751,23531600403,70598995513,211805375145,635432902651
%N Binomial transform of 0, 1, 1, 7, 7, 31, 31, ..., zero followed by duplicated A083420.
%F a(n+1)-3a(n) = A099430(n).
%F O.g.f.: (3x^2-2x+1)x/((2x-1)(1+x)(3x-1)(1-x)). - _R. J. Mathar_, Jul 10 2008
%F a(n)+a(n+1)=A126644(n). - _R. J. Mathar_, Jul 10 2008
%K nonn
%O 0,3
%A _Paul Curtz_, Jun 18 2008, corrected Jun 23 2008
%E More terms from _R. J. Mathar_, Jul 10 2008
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