a(n) = [y^(n+1)] (n + y) * Product_{k=1..2*n} (k + y), for n >= 0.
A322627
a(n) = [y^(n+1)] (n + y) * Product_{k=1..2*n} (k + y), for n >= 0.
Terms
- a(0) =1a(1) =4a(2) =55a(3) =1260a(4) =40593a(5) =1690920a(6) =86550035a(7) =5260335080a(8) =370410456273
External references
- oeis: A322627