Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + 2*A(x))^n = 1 + 4*Sum_{n>=1} (-1)^n * x^(n^2).
A370022
Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + 2*A(x))^n = 1 + 4*Sum_{n>=1} (-1)^n * x^(n^2).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =85a(5) =301a(6) =1086a(7) =3927a(8) =14328a(9) =52724a(10) =194915a(11) =723845a(12) =2699878a(13) =10104968a(14) =37933855a(15) =142795810a(16) =538829973a(17) =2037596590a(18) =7720231359a(19) =29302685197a(20) =111398230285a(21) =424115408181
External references
- oeis: A370022