The number of hierarchical orderings among the parts of the integer partitions of the integer n.

A104525

The number of hierarchical orderings among the parts of the integer partitions of the integer n.

Terms

    a(0) =1a(1) =4a(2) =12a(3) =40a(4) =123a(5) =395a(6) =1227a(7) =3851a(8) =11944a(9) =37032a(10) =114144a(11) =351040a(12) =1075316a(13) =3285398a(14) =10007731a(15) =30409157a(16) =92169561a(17) =278738219a(18) =841132013a(19) =2533138770a(20) =7614144053a(21) =22845435104a(22) =68427663680a(23) =204623945617a(24) =610951554377

External references