Number of closed walks of length n on the Petersen graph rooted at a given vertex.

Terms

a(0) =1a(1) =0a(2) =3a(3) =0a(4) =15a(5) =12a(6) =99a(7) =168a(8) =759a(9) =1764a(10) =6315a(11) =16896a(12) =54783a(13) =156156a(14) =484851a(15) =1421784a(16) =4330887a(17) =12861588a(18) =38846907a(19) =116016432a(20) =349097871a(21) =1045196460a(22) =3139783683a(23) =9410962440a(24) =28249664535a(25) =84715439172a(26) =254213426379a(27) =762506061408