Number of 5-cycles in the n-triangular honeycomb obtuse knight graph.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =30a(7) =120a(8) =294a(9) =552a(10) =894a(11) =1320a(12) =1830a(13) =2424a(14) =3102a(15) =3864a(16) =4710a(17) =5640a(18) =6654a(19) =7752a(20) =8934a(21) =10200a(22) =11550a(23) =12984a(24) =14502a(25) =16104a(26) =17790a(27) =19560a(28) =21414a(29) =23352