Number of n-move knight paths on 8 X 8 board from given corner to same corner.

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =16a(5) =0a(6) =264a(7) =0a(8) =6828a(9) =0a(10) =218192a(11) =0a(12) =7555444a(13) =0a(14) =269039512a(15) =0a(16) =9671837852a(17) =0a(18) =348829877760a(19) =0a(21) =0a(23) =0a(25) =0a(27) =0a(29) =0a(31) =0