Number of 10-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) =362880a(11) =3628800a(12) =19958400a(13) =159667200a(14) =1556755200a(15) =17435658240a(16) =217945728000