Number of ordered finite sequences a_1 <= a_2 <= ... <= a_n of length n of positive integers less than or equal to n whose product is n!.

A120690

Number of ordered finite sequences a_1 <= a_2 <= ... <= a_n of length n of positive integers less than or equal to n whose product is n!.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =6a(7) =6a(8) =13a(9) =33a(10) =97a(11) =97a(12) =306a(13) =306a(14) =896a(15) =2804a(16) =7974a(17) =7974a(18) =24929a(19) =24929a(20) =82612a(21) =263913a(22) =782310a(23) =782310a(24) =2692708a(25) =7705973a(26) =22901921a(27) =69066986a(28) =232517327a(29) =232517327

External references