a(n) = A359107(2*n, n) = Sum_{j=0..n} Stirling2(2*n, j) = Sum_{j=0..n} A048993(2*n, j).

A359355

a(n) = A359107(2*n, n) = Sum_{j=0..n} Stirling2(2*n, j) = Sum_{j=0..n} A048993(2*n, j).

Terms

    a(0) =1a(1) =1a(2) =8a(3) =122a(4) =2795a(5) =86472a(6) =3403127a(7) =164029595a(8) =9433737120a(9) =635182667816

External references