G.f. A(x) satisfies: A(x) = x + x^2 * exp(4 * Sum_{k>=1} (-1)^(k+1) * A(x^k) / k).
A345245
G.f. A(x) satisfies: A(x) = x + x^2 * exp(4 * Sum_{k>=1} (-1)^(k+1) * A(x^k) / k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =135a(6) =504a(7) =2000a(8) =8072a(9) =33099a(10) =138132a(11) =582930a(12) =2485412a(13) =10692219a(14) =46340984a(15) =202175344a(16) =887175352a(17) =3913032212a(18) =17338327848a(19) =77141235796a(20) =344491008296
External references
- oeis: A345245