G.f.: Sum_{n>=0} x^n * Sum_{k=0..n} C(n,k) * (1/(1-x)^k - 1)^k.

A245465

G.f.: Sum_{n>=0} x^n * Sum_{k=0..n} C(n,k) * (1/(1-x)^k - 1)^k.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =35a(6) =128a(7) =523a(8) =2329a(9) =11206a(10) =57685a(11) =315515a(12) =1824216a(13) =11097706a(14) =70771858a(15) =471589169a(16) =3274334755a(17) =23630689143a(18) =176882416706

External references