G.f. A(x) satisfies 1 = Sum_{n=-oo..+oo} x^(2*n) * (x^n - A(x))^(3*n+1).
A380677
G.f. A(x) satisfies 1 = Sum_{n=-oo..+oo} x^(2*n) * (x^n - A(x))^(3*n+1).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =36a(4) =198a(5) =1128a(6) =6837a(7) =42690a(8) =273960a(9) =1792650a(10) =11922735a(11) =80342746a(12) =547403208a(13) =3764568202a(14) =26097746670a(15) =182183863242
External references
- oeis: A380677