Sum of exponents in prime-power factorization of C(4n,n-4).

Terms

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