G.f.: A(x) satisfies: A(x) = Sum_{n>=0} x^n * (1+x)^(n*(n+1)) / A(x)^n.
A320951
G.f.: A(x) satisfies: A(x) = Sum_{n>=0} x^n * (1+x)^(n*(n+1)) / A(x)^n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =9a(5) =28a(6) =110a(7) =485a(8) =2358a(9) =12486a(10) =70726a(11) =425747a(12) =2702837a(13) =18004835a(14) =125337381a(15) =908737863a(16) =6843536374a(17) =53407750147a(18) =431075414218
External references
- oeis: A320951