INVERT transform of factorial numbers.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =47a(5) =231a(6) =1303a(7) =8431a(8) =62391a(9) =524495a(10) =4960775a(11) =52223775a(12) =605595319a(13) =7664578639a(14) =105046841127