a(n) = (1/(n+1)) * Sum_{k=0..n} k^4 * (k+1) * binomial(2*n-k,n-k).
A390967
a(n) = (1/(n+1)) * Sum_{k=0..n} k^4 * (k+1) * binomial(2*n-k,n-k).
Terms
- a(0) =0a(1) =1a(2) =18a(3) =134a(4) =738a(5) =3529a(6) =15626a(7) =66094a(8) =271592a(9) =1094970a(10) =4357916a(11) =17189832a(12) =67381030a(13) =262951065a(14) =1022931210a(15) =3970604310a(16) =15388650480a(17) =59579400030a(18) =230518577340a(19) =891563223876
External references
- oeis: A390967