a(n) = Sum_{k=1..n} (n + k - 1)! / (k!*(n - k)!) if n > 0 and a(0) = 1. Row sums of A370983.

A371028

a(n) = Sum_{k=1..n} (n + k - 1)! / (k!*(n - k)!) if n > 0 and a(0) = 1. Row sums of A370983.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =35a(4) =364a(5) =5189a(6) =94471a(7) =2095015a(8) =54793880a(9) =1651345449a(10) =56350158193

External references