Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 3 X 3 X 3 subtriangle.
A153901
Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 3 X 3 X 3 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =3a(5) =2a(6) =2a(7) =7a(8) =3a(9) =6a(10) =15a(11) =12a(12) =17a(13) =63a(14) =47a(15) =86a(16) =272a(17) =269a(18) =423a(19) =2020a(20) =1609a(21) =3902a(22) =14951a(23) =18193a(24) =36083a(25) =200112a(26) =201396a(27) =575152a(28) =2652677a(29) =3907855
External references
- oeis: A153901