a(n) = Sum_{k=0..n} binomial(n,k)^3 * 4^k.
A216483
a(n) = Sum_{k=0..n} binomial(n,k)^3 * 4^k.
Terms
- a(0) =1a(1) =5a(2) =49a(3) =605a(4) =8065a(5) =113525a(6) =1656145a(7) =24774125a(8) =377601025a(9) =5839329125a(10) =91349718769
External references
- oeis: A216483