Number of distinct products of distinct factorials up to n!.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =28a(7) =56a(8) =108a(9) =204a(10) =332a(11) =664a(12) =1114a(13) =2228a(14) =4078a(15) =7018a(16) =11402a(17) =22804a(18) =40638a(19) =81276a(20) =140490a(21) =230328a(22) =391544a(23) =783088a(24) =1287034a(25) =2273676a(26) =3903626a(27) =6837760a(28) =10368184a(29) =20736368