Number of Hamiltonian paths in P_5 X P_n.

Terms

a(0) =1a(1) =22a(2) =132a(3) =1006a(4) =4324a(5) =26996a(6) =109722a(7) =602804a(8) =2434670a(9) =12287118a(10) =49852352a(11) =237425498a(12) =969300694a(13) =4434629912a(14) =18203944458a(15) =80978858522a(16) =333840165288