a(n) = Sum_{k=0..n} binomial(n,k)^3 * 5^k.
A216636
a(n) = Sum_{k=0..n} binomial(n,k)^3 * 5^k.
Terms
- a(0) =1a(1) =6a(2) =66a(3) =936a(4) =14346a(5) =231876a(6) =3885456a(7) =66767616a(8) =1169068986a(9) =20769386796a(10) =373277526876
External references
- oeis: A216636