Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 4 X 4 X 4 subtriangle.

A153923

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 4 X 4 X 4 subtriangle.

Terms

    a(0) =1a(1) =2a(2) =723a(3) =3847a(4) =12686a(5) =64066a(6) =522788a(7) =2375205a(8) =17429033a(9) =207659953a(10) =1416380562a(11) =15388271829a(12) =267002004687

External references