First differences of A003418(n) = lcm(1..n).

Terms

a(0) =0a(1) =1a(2) =4a(3) =6a(4) =48a(5) =0a(6) =360a(7) =420a(8) =1680a(9) =0a(10) =25200a(11) =0a(12) =332640a(13) =0a(14) =0a(15) =360360a(16) =11531520a(17) =0a(18) =220540320a(19) =0a(20) =0a(21) =0a(22) =5121436320a(23) =0a(24) =21416915520a(25) =0a(26) =53542288800a(27) =0a(29) =0a(32) =0