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

Terms

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