a(n) = Sum_{k = 0..n} binomial(n,k)^3*binomial(n+k,k).
A014178
a(n) = Sum_{k = 0..n} binomial(n,k)^3*binomial(n+k,k).
Terms
- a(0) =1a(1) =3a(2) =31a(3) =399a(4) =5871a(5) =93753a(6) =1577479a(7) =27556623a(8) =495001327a(9) =9085988613a(10) =169675769781
External references
- oeis: A014178