G.f. A(x) satisfies A(x) = (1 + x) * C(x*A(x)^2), where C(x) is the g.f. of A000108.
A381785
G.f. A(x) satisfies A(x) = (1 + x) * C(x*A(x)^2), where C(x) is the g.f. of A000108.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =45a(4) =335a(5) =2731a(6) =23573a(7) =211741a(8) =1958571a(9) =18529392a(10) =178459000a(11) =1743868792a(12) =17246702932a(13) =172302244669
External references
- oeis: A381785