a(n) = A000111(n) * A000142(n). Row sums of A373434.

A373433

a(n) = A000111(n) * A000142(n). Row sums of A373434.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =12a(4) =120a(5) =1920a(6) =43920a(7) =1370880a(8) =55843200a(9) =2879815680a(10) =183330604800

External references