Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 4 X 4 X 4 subtriangle.
A153967
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 4 X 4 X 4 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =7a(5) =15a(6) =30a(7) =103a(8) =229a(9) =913a(10) =3237a(11) =14316a(12) =56401a(13) =399787a(14) =1756484a(15) =13874163a(16) =97904334a(17) =862620519a(18) =6788122417a(19) =96037644217a(20) =842802659086
External references
- oeis: A153967