Number of anti-run permutations of the prime indices of n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =0a(5) =2a(6) =3a(7) =54a(8) =0a(9) =30a(10) =105a(11) =6090a(12) =1512a(13) =133056a(14) =816480a(15) =127209600a(16) =0a(17) =10090080a(18) =562161600a(19) =69864795000a(20) =49989139200