Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 1 one in any 5 X 5 X 5 subtriangle.
A153905
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 1 one in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =2a(5) =1a(6) =2a(7) =5a(8) =6a(9) =9a(10) =17a(11) =17a(12) =26a(13) =58a(14) =75a(15) =126a(16) =312a(17) =396a(18) =728a(19) =2092a(20) =2615a(21) =5251a(22) =16697a(23) =25367a(24) =59223a(25) =199945a(26) =337534a(27) =830329a(28) =2967422a(29) =5495637
External references
- oeis: A153905