a(n) = Sum_{k=0..floor(n/2)} (binomial(n,k) * binomial(n-k,k))^2.
A382841
a(n) = Sum_{k=0..floor(n/2)} (binomial(n,k) * binomial(n-k,k))^2.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =37a(4) =181a(5) =1301a(6) =9401a(7) =65465a(8) =498037a(9) =3796021a(10) =29221705a(11) =230396585a(12) =1828448425a(13) =14651160265a(14) =118544522045a(15) =965075143037
External references
- oeis: A382841