G.f. A(x) satisfies A(x) = B(x*A(x)) / (1 - x)^2, where B(x) is the g.f. of A001764.
A381943
G.f. A(x) satisfies A(x) = B(x*A(x)) / (1 - x)^2, where B(x) is the g.f. of A001764.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =60a(4) =425a(5) =3426a(6) =29619a(7) =267738a(8) =2497889a(9) =23866056a(10) =232325475a(11) =2295889266a(12) =22971682893a(13) =232248775669
External references
- oeis: A381943