Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 13 ones in any 5 X 5 X 5 subtriangle.
A154002
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 13 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =8a(5) =15a(6) =30a(7) =121a(8) =231a(9) =922a(10) =3737a(11) =14596a(12) =58211a(13) =469831a(14) =1835827a(15) =14554240a(16) =117947573a(17) =917117580a(18) =7292920219a(19) =117680064956a(20) =918073021793
External references
- oeis: A154002