Closed walks of length n along the edges of a dodecahedron based at a vertex.

Terms

a(0) =1a(1) =0a(2) =3a(3) =0a(4) =15a(5) =6a(6) =87a(7) =84a(8) =567a(9) =882a(10) =4095a(11) =8448a(12) =32079a(13) =78078a(14) =265863a(15) =710892a(16) =2282631a(17) =6430794a(18) =20009391a(19) =58008216a(20) =177478623a(21) =522598230a(22) =1584540279a(23) =4705481220a(24) =14198074455a(25) =42357719586a(26) =127472924127a(27) =381253030704