G.f. satisfies A(x) = 1 + x*A(x)^2*(1 + A(x))^2/2.
A219538
G.f. satisfies A(x) = 1 + x*A(x)^2*(1 + A(x))^2/2.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =98a(4) =924a(5) =9468a(6) =102432a(7) =1151410a(8) =13315692a(9) =157406876a(10) =1893480264a(11) =23103024084a(12) =285233168760
External references
- oeis: A219538