Number of Hamiltonian cycles in P_6 X P_n.

Terms

a(0) =0a(1) =1a(2) =4a(3) =37a(4) =154a(5) =1072a(6) =5320a(7) =32675a(8) =175294a(9) =1024028a(10) =5668692a(11) =32463802a(12) =181971848a(13) =1033917350a(14) =5824476298a(15) =32989068162a(16) =186210666468