a(n) = Sum_{k=0..n} binomial(n,k)^3 * 2^k * 3^(n-k).
A217280
a(n) = Sum_{k=0..n} binomial(n,k)^3 * 2^k * 3^(n-k).
Terms
- a(0) =1a(1) =5a(2) =61a(3) =845a(4) =12865a(5) =206525a(6) =3434005a(7) =58542125a(8) =1016757025a(9) =17915319125a(10) =319316172781
External references
- oeis: A217280