Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 5 X 5 X 5 subtriangle.
A153935
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =8a(5) =6a(6) =19a(7) =86a(8) =201a(9) =747a(10) =4737a(11) =13222a(12) =67580a(13) =644447a(14) =2591663a(15) =18812351a(16) =265019022a(17) =1467585490a(18) =15658902928a(19) =326360337439
External references
- oeis: A153935