a(n) = A074639(A074645(n)).

Terms

a(0) =0a(1) =0a(2) =2a(3) =4a(4) =12a(5) =16a(6) =60a(7) =64a(8) =84a(9) =160a(10) =280a(11) =208a(12) =256a(13) =1080a(14) =1860a(15) =3840a(16) =2256a(17) =3612a(18) =3960a(19) =3816a(20) =9940a(21) =13248a(22) =93380a(23) =59904a(24) =160704a(25) =78400a(26) =78048a(27) =365040a(28) =688168a(29) =327168