Possible number of trailing zeros in hyperfactorials (A002109).

Terms

a(0) =0a(1) =5a(2) =15a(3) =30a(4) =50a(5) =100a(6) =130a(7) =165a(8) =205a(9) =250a(10) =350a(11) =405a(12) =465a(13) =530a(14) =600a(15) =750a(16) =830a(17) =915a(18) =1005a(19) =1100a(20) =1300a(21) =1405a(22) =1515a(23) =1630a(24) =1750a(25) =2125a(26) =2255a(27) =2390a(28) =2530a(29) =2675