Fourth Lie-Betti number of a path graph on n vertices.

Terms

a(0) =0a(1) =0a(2) =3a(3) =16a(4) =48a(5) =107a(6) =203a(7) =347a(8) =551a(9) =828a(10) =1192a(11) =1658a(12) =2242a(13) =2961a(14) =3833a(15) =4877a(16) =6113a(17) =7562a(18) =9246a(19) =11188a(20) =13412a(21) =15943a(22) =18807a(23) =22031a(24) =25643a(25) =29672a(26) =34148a(27) =39102a(28) =44566a(29) =50573