Number of Hamiltonian paths in C_4 X P_n.

Terms

a(0) =4a(1) =72a(2) =584a(3) =4016a(4) =24656a(5) =140624a(6) =761960a(7) =3976704a(8) =20173280a(9) =100097008a(10) =488003448a(11) =2345542720a(12) =11142878992a(13) =52426883056a(14) =244682331976