Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 7 ones in any 5 X 5 X 5 subtriangle.
A153958
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 7 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =8a(6) =14a(7) =52a(8) =78a(9) =248a(10) =909a(11) =2324a(12) =7268a(13) =47501a(14) =121021a(15) =658137a(16) =4239215a(17) =19354790a(18) =106079779a(19) =1177208160a(20) =5469153552a(21) =52045617401a(22) =594802267838
External references
- oeis: A153958