G.f. A(x) satisfies: x = A(x) * (1 + A(x)) * (1 - 2*A(x)).
A250886
G.f. A(x) satisfies: x = A(x) * (1 + A(x)) * (1 - 2*A(x)).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =15a(4) =68a(5) =322a(6) =1608a(7) =8283a(8) =43780a(9) =235950a(10) =1291992a(11) =7167030a(12) =40192488a(13) =227488900a(14) =1297845008a(15) =7455558675a(16) =43088726148a(17) =250362137590
External references
- oeis: A250886