Number of directed Hamiltonian paths in the 2n-crossed prism graph.

Terms

a(0) =144a(1) =576a(2) =1920a(3) =5760a(4) =16128a(5) =43008a(6) =110592a(7) =276480a(8) =675840a(9) =1622016a(10) =3833856a(11) =8945664a(12) =20643840a(13) =47185920a(14) =106954752a(15) =240648192a(16) =537919488a(17) =1195376640a(18) =2642411520a(19) =5813305344a(20) =12733906944a(21) =27783069696a(22) =60397977600a(23) =130862284800a(24) =282662535168a(25) =608811614208