G.f.: Sum_{n>=0} [Sum_{k=0..n} C(n,k)^2*x^k]^n*x^n.
A183166
G.f.: Sum_{n>=0} [Sum_{k=0..n} C(n,k)^2*x^k]^n*x^n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =46a(5) =343a(6) =3025a(7) =32811a(8) =417348a(9) =6106921a(10) =102307571a(11) =1918139824a(12) =40190540565a(13) =928661958828
External references
- oeis: A183166