Sum of exponents in prime-power factorization of C(3n,n+2).

Terms

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