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

Terms

a(0) =0a(1) =4a(2) =7a(3) =11a(4) =12a(5) =16a(6) =17a(7) =23a(8) =21a(9) =23a(10) =24a(11) =28a(12) =27a(13) =33a(14) =36a(15) =37a(16) =33a(17) =38a(18) =37a(19) =42a(20) =41a(21) =44a(22) =46a(23) =52a(24) =48a(25) =51a(26) =52a(27) =51a(28) =50a(29) =55