Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 3 X 3 X 3 subtriangle.
A153899
Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation 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) =4a(6) =6a(7) =13a(8) =17a(9) =34a(10) =101a(11) =146a(12) =325a(13) =1195a(14) =2277a(15) =6460a(16) =27376a(17) =61961a(18) =214755a(19) =1116386a(20) =3024411a(21) =12485340a(22) =79544755a(23) =263062079a(24) =1324332721a(25) =10146383904a(26) =40752385354a(27) =249319033030
External references
- oeis: A153899