Expansion of 1/((1-4*x*c(x))(1-x^2*c(x))), c(x) the g.f. of A000108.
A117381
Expansion of 1/((1-4*x*c(x))(1-x^2*c(x))), c(x) the g.f. of A000108.
Terms
- a(0) =1a(1) =4a(2) =21a(3) =109a(4) =575a(5) =3047a(6) =16192a(7) =86171a(8) =458972a(9) =2445825a(10) =13037508a(11) =69509558a(12) =370634265a(13) =1976421031a(14) =10539858413a(15) =56208784808a(16) =299766435277
External references
- oeis: A117381