Number of 4-colorings of cyclic group of order n.

Terms

a(0) =3a(1) =10a(2) =21a(3) =44a(4) =83a(5) =218a(6) =271a(7) =692a(8) =865a(9) =2622a(10) =2813a(11) =9220a(12) =9735a(13) =35214a(14) =35911a(15) =135564a(16) =136899a(17) =533290a(18) =535081