a(n) = Sum_{k=0..n} binomial(n+k-1,n) * binomial(n+k,n).
A374675
a(n) = Sum_{k=0..n} binomial(n+k-1,n) * binomial(n+k,n).
Terms
- a(0) =1a(1) =2a(2) =21a(3) =244a(4) =3055a(5) =40116a(6) =544103a(7) =7553960a(8) =106734195a(9) =1528937200a(10) =22143771386a(11) =323613807672
External references
- oeis: A374675