Sum of exponents in prime-power factorization of multinomial coefficient M(4n;2n,n,n).

Terms

a(0) =0a(1) =3a(2) =5a(3) =8a(4) =9a(5) =11a(6) =12a(7) =17a(8) =15a(9) =17a(10) =18a(11) =20a(12) =20a(13) =24a(14) =25a(15) =26a(16) =24a(17) =27a(18) =26a(19) =30a(20) =29a(21) =32a(22) =34a(23) =37a(24) =35a(25) =37a(26) =37a(27) =37a(28) =36a(29) =39