5-adic valuation of binomial(2*n,n): largest k such that 5^k divides binomial(2*n, n).

Terms

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