G.f.: A(x) = 1/(1 - x*B(x)), where B(x) = 1/(1 - x*C(x)^2); C(x) = 1/(1 - x*D(x)^3); D(x) = 1/(1 - x*E(x)^4); ...

A197772

G.f.: A(x) = 1/(1 - x*B(x)), where B(x) = 1/(1 - x*C(x)^2); C(x) = 1/(1 - x*D(x)^3); D(x) = 1/(1 - x*E(x)^4); ...

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =25a(5) =138a(6) =968a(7) =8313a(8) =84735a(9) =1000322a(10) =13418848a(11) =201526744a(12) =3348677251a(13) =60981586323

External references