G.f.: Sum_{n>=0} (3*n+1)^n * x^n / (1 + (3*n+1)*x)^n.
A187738
G.f.: Sum_{n>=0} (3*n+1)^n * x^n / (1 + (3*n+1)*x)^n.
Terms
- a(0) =1a(1) =4a(2) =33a(3) =378a(4) =5508a(5) =97200a(6) =2012040a(7) =47764080a(8) =1278607680a(9) =38093690880
External references
- oeis: A187738