First column (k=2) of array A091534 ((5,2)-Stirling2).

A091535

First column (k=2) of array A091534 ((5,2)-Stirling2).

Terms

    a(0) =1a(1) =20a(2) =1120a(3) =123200a(4) =22422400a(5) =6098892800

External references