Numbers k that are less than distance j from j! for some positive integer j.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =21a(9) =22a(10) =23a(11) =24a(12) =25a(13) =26a(14) =27a(15) =116a(16) =117a(17) =118a(18) =119a(19) =120a(20) =121a(21) =122a(22) =123a(23) =124a(24) =715a(25) =716a(26) =717a(27) =718a(28) =719a(29) =720