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

Terms

a(0) =0a(1) =0a(2) =24a(3) =324a(4) =1692a(5) =5796a(6) =15516a(7) =35388a(8) =71988a(9) =134460a(10) =234972a(11) =389304a(12) =617400a(13) =943992a(14) =1399272a(15) =2019528a(16) =2847960a(17) =3935304a(18) =5340816a(19) =7132860a(20) =9390084a(21) =12201948a(22) =15670116a(23) =19908900a(24) =25046892a(25) =31227300a(26) =38609844a(27) =47370960a(28) =57705984a(29) =69829200