a(n) = sum of the exponents in the prime factorization of LCM{1,3,6,...,C(n+1,2)}.

Terms

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