Sum of exponents in prime-power factorization of C(4n,n-3).

Terms

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