Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 9 ones in any 4 X 4 X 4 subtriangle.
A153965
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation 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) =15a(5) =31a(6) =126a(7) =927a(8) =3933a(9) =31429a(10) =472959a(11) =4005742a(12) =63878219a(13) =1917687587a(14) =32433255622
External references
- oeis: A153965