Hit polynomials.

Terms

a(0) =1a(1) =10a(2) =34a(3) =206a(4) =1351a(5) =10543a(6) =92708a(7) =912884a(8) =9917445a(9) =117838808a(10) =1519483258a(11) =21128310078a(12) =315093762147