Number of directed Hamiltonian paths on the n-antiprism graph.

Terms

a(0) =240a(1) =816a(2) =2400a(3) =6480a(4) =16660a(5) =41440a(6) =100836a(7) =241520a(8) =571692a(9) =1340832a(10) =3121456a(11) =7222040a(12) =16622220a(13) =38085312a(14) =86918688a(15) =197677368a(16) =448182640a(17) =1013320480a(18) =2285339532a(19) =5142429512a(20) =11547488652a(21) =25881229248a(22) =57906534100a(23) =129352490384a(24) =288522099360a(25) =642668803056