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

Terms

a(0) =0a(1) =0a(2) =2a(3) =24a(4) =138a(5) =532a(6) =1596a(7) =4032a(8) =8988a(9) =18216a(10) =34254a(11) =60632a(12) =102102a(13) =164892a(14) =256984a(15) =388416a(16) =571608a(17) =821712a(18) =1156986a(19) =1599192a(20) =2174018a(21) =2911524a(22) =3846612a(23) =5019520a(24) =6476340a(25) =8269560a(26) =10458630a(27) =13110552a(28) =16300494a(29) =20112428