Number of n-step closed paths on the Cairo pentagonal lattice graph starting from a degree-4 node.

A357810

Number of n-step closed paths on the Cairo pentagonal lattice graph starting from a degree-4 node.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =0a(4) =24a(5) =8a(6) =164a(7) =136a(8) =1236a(9) =1704a(10) =10116a(11) =19144a(12) =88616a(13) =205208a(14) =818764a(15) =2155160a(16) =7873440a(17) =22463400a(18) =77954740a(19) =233894600a(20) =788314984a(21) =2440865400a(22) =8095906076a(23) =25569342520a(24) =84107990356a(25) =269034666280

External references