Number of ways to color vertices of a heptagon using <= n colors, allowing rotations and reflections.

A060532

Number of ways to color vertices of a heptagon using <= n colors, allowing rotations and reflections.

Terms

    a(0) =0a(1) =1a(2) =18a(3) =198a(4) =1300a(5) =5895a(6) =20646a(7) =60028a(8) =151848a(9) =344925a(10) =719290a(11) =1399266a(12) =2569788a(13) =4496323a(14) =7548750a(15) =12229560a(16) =19206736a(17) =29351673a(18) =43782498a(19) =63913150a(20) =91508580a(21) =128746431a(22) =178285558a(23) =243341748a(24) =327771000a(25) =436160725a(26) =573929226a(27) =747433818a(28) =964087948a(29) =1232487675

External references