Numbers of undirected cycles in the 2n-crossed prism graph.

Terms

a(0) =6a(1) =28a(2) =107a(3) =380a(4) =1345a(5) =4878a(6) =18219a(7) =69736a(8) =271589a(9) =1069538a(10) =4240351a(11) =16877532a(12) =67325913a(13) =268902358a(14) =1074741203a(15) =4297097168a(16) =17184391117a(17) =68729044938a(18) =274898091975