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

Terms

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