Sum_{k = 0..n} C(n, k)^2*C(n+k, n)*C(n+2*k, n).
A098274
Sum_{k = 0..n} C(n, k)^2*C(n+k, n)*C(n+2*k, n).
Terms
- a(0) =1a(1) =7a(2) =163a(3) =5191a(4) =191251a(5) =7665757a(6) =324610399a(7) =14287393351a(8) =647133545107
External references
- oeis: A098274