Sum of fifth powers of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^5 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.
A132305
Sum of fifth powers of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^5 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.
Terms
- a(0) =1a(1) =3a(2) =309a(3) =32847a(4) =4775301a(5) =764206503a(6) =131689759209
External references
- oeis: A132305