A068107 n! sum{k=1 to n} mu(k)/k!, where mu(k) is the Moebius function.

1, 1, 2, 8, 39, 235, 1644, 13152, 118368, 1183681, 13020490, 156245880, 2031196439, 28436750147, 426551252206, 6824820035296, 116021940600031, 2088394930800558, 39679503685210601, 793590073704212020