Number of non-equivalent (mod D_3) ways to place 3 indistinguishable points on a triangular grid of side n so that no two of them are adjacent.

A239573

Number of non-equivalent (mod D_3) ways to place 3 indistinguishable points on a triangular grid of side n so that no two of them are adjacent.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =32a(4) =113a(5) =329a(6) =790a(7) =1702a(8) =3320a(9) =6057a(10) =10400a(11) =17074a(12) =26903a(13) =41047a(14) =60796a(15) =87886a(16) =124220a(17) =172275a(18) =234732a(19) =314992a(20) =416703a(21) =544391a(22) =702878a(23) =898040a(24) =1136098a(25) =1424521a(26) =1771178a(27) =2185392a(28) =2676947a(29) =3257305

External references