G.f.: Sum_{n>=0} 2^n * ((1+x)^n - 1)^n.
A301581
G.f.: Sum_{n>=0} 2^n * ((1+x)^n - 1)^n.
Terms
- a(0) =1a(1) =2a(2) =16a(3) =232a(4) =4748a(5) =125440a(6) =4058312a(7) =155336672a(8) =6864980968a(9) =343995674280
External references
- oeis: A301581
A301581
G.f.: Sum_{n>=0} 2^n * ((1+x)^n - 1)^n.