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E.g.f.: exp(1/((1+x)*(1+x^2)) - 1).
2

%I #9 Oct 27 2017 10:16:13

%S 1,-1,1,-1,25,-241,1081,-3361,68881,-1288225,11828881,-69917761,

%T 1347298921,-36402297361,533785676425,-4949573821921,96936811739041,

%U -3274354780495681,67608887254849441,-885780921100074625,18450482854023522361,-718444927697360335921

%N E.g.f.: exp(1/((1+x)*(1+x^2)) - 1).

%H Seiichi Manyama, <a href="/A294290/b294290.txt">Table of n, a(n) for n = 0..446</a>

%o (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp(1/((1+x)*(1+x^2))-1)))

%Y Column k=2 of A294289.

%K sign

%O 0,5

%A _Seiichi Manyama_, Oct 27 2017