G.f.: 1 = Sum_{n>=0} a(n)*x^n* Sum_{k>=0} C(2n+k,k)^2*(-x)^k.
A181167
G.f.: 1 = Sum_{n>=0} a(n)*x^n* Sum_{k>=0} C(2n+k,k)^2*(-x)^k.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =165a(4) =6384a(5) =397320a(6) =36273600a(7) =4566166605a(8) =757975618400
External references
- oeis: A181167