Number of 5-ary search trees on n keys.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =15a(7) =35a(8) =70a(9) =146a(10) =360a(11) =980a(12) =2620a(13) =6620a(14) =16276a(15) =40740a(16) =105820a(17) =280780a(18) =743700a(19) =1950756a(20) =5101470a(21) =13429110a(22) =35693650a(23) =95433290a(24) =255434106a(25) =683340050a(26) =1829832350a(27) =4913953750a(28) =13239959100a(29) =35758234300