G.f. satisfies A(x) = ( 1 + x * A(x)^2 * (1 + A(x)) )^2.
A371680
G.f. satisfies A(x) = ( 1 + x * A(x)^2 * (1 + A(x)) )^2.
Terms
- a(0) =1a(1) =4a(2) =44a(3) =648a(4) =10960a(5) =200992a(6) =3886928a(7) =78043488a(8) =1611405504a(9) =33998715264a(10) =729793915264
External references
- oeis: A371680