State assignments for n-state machine.

Terms

a(0) =0a(1) =1a(2) =3a(3) =3a(4) =140a(5) =420a(6) =840a(7) =840a(8) =10810800a(9) =75675600a(10) =454053600a(11) =2270268000a(12) =9081072000a(13) =27243216000a(14) =54486432000a(15) =54486432000