a(n) = Sum_{k = 0..n-1} binomial(n,k)^2*binomial(n+k-1,k).
A361715
a(n) = Sum_{k = 0..n-1} binomial(n,k)^2*binomial(n+k-1,k).
Terms
- a(0) =0a(1) =1a(2) =9a(3) =82a(4) =745a(5) =6876a(6) =64764a(7) =621860a(8) =6070761a(9) =60085720a(10) =601493134a(11) =6078225792a(12) =61907445340a(13) =634751002718
External references
- oeis: A361715