Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + 3*A(x))^n = 1 + 5*Sum_{n>=1} (-1)^n * x^(n^2).
A370023
Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + 3*A(x))^n = 1 + 5*Sum_{n>=1} (-1)^n * x^(n^2).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =53a(4) =234a(5) =1041a(6) =4711a(7) =21573a(8) =99484a(9) =461657a(10) =2154591a(11) =10102701a(12) =47555840a(13) =224624016a(14) =1064183887a(15) =5055060411a(16) =24068888061a(17) =114841741098a(18) =548992775523
External references
- oeis: A370023