Sum of exponents in prime-power factorization of C(4n,n+1).

Terms

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