Number of 6-cycles in the n-triangular honeycomb queen graph.

Terms

a(0) =0a(1) =0a(2) =16a(3) =911a(4) =8013a(5) =38130a(6) =129932a(7) =358272a(8) =851710a(9) =1815124a(10) =3554910a(11) =6510729a(12) =11289019a(13) =18704640a(14) =29823436a(15) =46014402a(16) =69002190a(17) =100930284a(18) =144424446a(19) =202667301a(20) =279473821a(21) =379377584a(22) =507719550a(23) =670746120a(24) =875712560a(25) =1130992902a(26) =1446199474a(27) =1832304547a(28) =2301777585a(29) =2868718404