Number of non-equivalent (mod D_3) ways to place 5 indistinguishable points on a triangular grid of side n so that no two of them are adjacent.
A239575
Number of non-equivalent (mod D_3) ways to place 5 indistinguishable points on a triangular grid of side n so that no two of them are adjacent.
Terms
- a(0) =0a(1) =0a(2) =7a(3) =176a(4) =1976a(5) =12565a(6) =57275a(7) =207018a(8) =634166a(9) =1711262a(10) =4181915a(11) =9428657a(12) =19892816a(13) =39684027a(14) =75473209a(15) =137721045a(16) =242391212a(17) =413215132a(18) =684733527a(19) =1106194950a(20) =1746637600a(21) =2701244609a(22) =4099429895a(23) =6114748948a(24) =8977257362a(25) =12988406970a(26) =18539308619a(27) =26132434991
External references
- oeis: A239575