Factorial splitting: write n! = x*y with x <= y and x maximal; sequence gives value of y-x.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =6a(6) =2a(7) =18a(8) =54a(9) =30a(10) =36a(11) =576a(12) =127a(13) =840a(14) =928a(15) =3712a(16) =20160a(17) =93696a(18) =420480a(19) =800640a(20) =1305696a(21) =7983360a(22) =55056804a(23) =65318400a(24) =326592000a(25) =2286926400a(26) =2610934480a(27) =13680979200a(28) =18906930876a(29) =674165366496