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 A092535 G.f.: (1+x^2)*(1+x^3)/((1-x)*(1-x^2)). 0

%I

%S 1,1,3,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,

%T 48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,

%U 94,96,98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132

%N G.f.: (1+x^2)*(1+x^3)/((1-x)*(1-x^2)).

%H G. Nebe, E. M. Rains and N. J. A. Sloane, <a href="http://neilsloane.com/doc/cliff2.html">Self-Dual Codes and Invariant Theory</a>, Springer, Berlin, 2006.

%H <a href="/index/Mo#Molien">Index entries for Molien series</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1)

%F The even numbers >= 4, prefixed by 1, 1, 3.

%F G.f.: 1+x+3*x^2+(4-2*x)*x^3/(1-x)^2. a(n)=A004278(n), n<>1. [From _R. J. Mathar_, Dec 15 2008]

%K nonn,easy

%O 0,3

%A _N. J. A. Sloane_, Apr 08 2004

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)