Number A(n,k) of k-ary heaps on n levels; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =0a(6) =1a(7) =1a(8) =1a(9) =0a(10) =1a(11) =1a(12) =2a(13) =1a(14) =0a(15) =1a(16) =1a(17) =6a(18) =80a(19) =1a(20) =0a(21) =1a(22) =1a(23) =24a(24) =7484400a(25) =21964800a(26) =1a(27) =0a(28) =1a(29) =1