a(n) = Sum_{k = 0..n} (-4)^(n-k)*binomial(n,k)*binomial(2*n+k,k)*binomial(2*k,k).
A363985
a(n) = Sum_{k = 0..n} (-4)^(n-k)*binomial(n,k)*binomial(2*n+k,k)*binomial(2*k,k).
Terms
- a(0) =1a(1) =2a(2) =26a(3) =272a(4) =3418a(5) =44252a(6) =597104a(7) =8249152a(8) =116158298a(9) =1659335492a(10) =23979247276a(11) =349798313152
External references
- oeis: A363985