Number of ways to color vertices of a pentagon using <= n colors, allowing only rotations.

Terms

a(0) =0a(1) =1a(2) =8a(3) =51a(4) =208a(5) =629a(6) =1560a(7) =3367a(8) =6560a(9) =11817a(10) =20008a(11) =32219a(12) =49776a(13) =74269a(14) =107576a(15) =151887a(16) =209728a(17) =283985a(18) =377928a(19) =495235a(20) =640016a(21) =816837a(22) =1030744a(23) =1287287a(24) =1592544a(25) =1953145a(26) =2376296a(27) =2869803a(28) =3442096a(29) =4102253