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

Terms

a(0) =0a(1) =0a(2) =1a(3) =57a(4) =486a(5) =2360a(6) =8394a(7) =24354a(8) =61104a(9) =137412a(10) =283635a(11) =546403a(12) =994422a(13) =1725516a(14) =2875028a(15) =4625700a(16) =7219152a(17) =10969080a(18) =16276293a(19) =23645709a(20) =33705430a(21) =47228016a(22) =65154078a(23) =88618310a(24) =118978080a(25) =157844700a(26) =207117495a(27) =269020791a(28) =346143942a(29) =441484516