Third Lie-Betti number of a cycle graph on n vertices.

Terms

a(0) =12a(1) =25a(2) =41a(3) =68a(4) =105a(5) =152a(6) =210a(7) =280a(8) =363a(9) =460a(10) =572a(11) =700a(12) =845a(13) =1008a(14) =1190a(15) =1392a(16) =1615a(17) =1860a(18) =2128a(19) =2420a(20) =2737a(21) =3080a(22) =3450a(23) =3848a(24) =4275a(25) =4732a(26) =5220a(27) =5740a(28) =6293a(29) =6880