Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 13 ones in any 5 X 5 X 5 subtriangle.
A154000
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation 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) =16a(5) =31a(6) =126a(7) =1009a(8) =3933a(9) =31428a(10) =512187a(11) =4017316a(12) =64213559a(13) =2090787507a(14) =32776879657
External references
- oeis: A154000