A294290 E.g.f.: exp(1/((1+x)*(1+x^2)) - 1).

1, -1, 1, -1, 25, -241, 1081, -3361, 68881, -1288225, 11828881, -69917761, 1347298921, -36402297361, 533785676425, -4949573821921, 96936811739041, -3274354780495681, 67608887254849441, -885780921100074625, 18450482854023522361, -718444927697360335921

Offset: 0

Author

Seiichi Manyama, Oct 27 2017

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..446

Crossrefs

Column k=2 of A294289.

Programs

PARI

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