Sum of n-th row of A081551.

A081553

Sum of n-th row of A081551.

Terms

    a(0) =1a(1) =21a(2) =303a(3) =4006a(4) =50010a(5) =600015a(6) =7000021a(7) =80000028a(8) =900000036a(9) =10000000045a(10) =110000000055

External references