Number of 8-ary heaps on n elements.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =24a(6) =120a(7) =720a(8) =5040a(9) =40320a(10) =181440a(11) =1209600a(12) =9979200a(13) =95800320a(14) =1037836800a(15) =12454041600a(16) =163459296000