k!-j!, where (k!,j!) is the least pair of distinct factorials for which n divides k!-j!.

Terms

a(0) =1a(1) =4a(2) =18a(3) =4a(4) =5a(5) =18a(6) =119a(7) =96a(8) =18a(9) =600a(10) =22a(11) =96a(12) =362856a(13) =714a(14) =600a(15) =96a(16) =119a(17) =18a(18) =114a(19) =600a(20) =714a(21) =22a(22) =23a(23) =96a(24) =600a(25) =362856a(26) =4320a(27) =35280a(28) =696a(29) =600