Number of 0's in n!.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =2a(8) =2a(9) =1a(10) =2a(11) =2a(12) =4a(13) =4a(14) =2a(15) =4a(16) =4a(17) =4a(18) =5a(19) =6a(20) =7a(21) =7a(22) =8a(23) =5a(24) =6a(25) =9a(26) =8a(27) =9a(28) =10a(29) =7