Number of cycles in the complement of a path.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =3a(6) =23a(7) =153a(8) =1077a(9) =8490a(10) =75234a(11) =742710a(12) =8084990a(13) =96192405a(14) =1241588865a(15) =17277139383a(16) =257810397243