Number of chordless cycles in the complete tripartite graph K_{n,n,n}.

Terms

a(0) =0a(1) =3a(2) =27a(3) =108a(4) =300a(5) =675a(6) =1323a(7) =2352a(8) =3888a(9) =6075a(10) =9075a(11) =13068a(12) =18252a(13) =24843a(14) =33075a(15) =43200a(16) =55488a(17) =70227a(18) =87723a(19) =108300a(20) =132300a(21) =160083a(22) =192027a(23) =228528a(24) =270000a(25) =316875a(26) =369603a(27) =428652a(28) =494508a(29) =567675