Number of Hamiltonian paths in D_4 X P_n.

Terms

a(0) =2a(1) =40a(2) =240a(3) =1558a(4) =8300a(5) =43438a(6) =212700a(7) =1014700a(8) =4691580a(9) =21257258a(10) =94520524a(11) =414149254a(12) =1791339472a(13) =7664373014a(14) =32481662616a(15) =136520499746a(16) =569599125312