Number of permutations of n elements divided by the number of 5-ary heaps on n+1 elements.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =4a(9) =5a(10) =6a(11) =12a(12) =18a(13) =24a(14) =30a(15) =36a(16) =72a(17) =108a(18) =144a(19) =180a(20) =216a(21) =432a(22) =648a(23) =864a(24) =1080a(25) =1296a(26) =2592a(27) =3888a(28) =5184a(29) =6480