Sum of exponents in prime-power factorization of C(5n,n).

Terms

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