Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 4 X 4 X 4 subtriangle.
A153902
Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 4 X 4 X 4 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =8a(8) =9a(9) =13a(10) =28a(11) =40a(12) =68a(13) =188a(14) =247a(15) =498a(16) =1534a(17) =2240a(18) =5457a(19) =19030a(20) =34984a(21) =92787a(22) =351730a(23) =736460a(24) =2179274a(25) =9660082a(26) =22277066a(27) =75466794a(28) =381461162a(29) =984019235
External references
- oeis: A153902