Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 5 X 5 X 5 subtriangle.
A153906
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =3a(5) =4a(6) =6a(7) =11a(8) =18a(9) =31a(10) =50a(11) =107a(12) =181a(13) =433a(14) =779a(15) =1919a(16) =3907a(17) =10795a(18) =25121a(19) =75000a(20) =190622a(21) =625348a(22) =1698419a(23) =6161541a(24) =18153209a(25) =72093319a(26) =233832256a(27) =1013942489a(28) =3627226950a(29) =17175822290
External references
- oeis: A153906