Sum of exponents in prime-power factorization of C(4n,n+2).

Terms

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