Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 5 X 5 X 5 subtriangle.
A153926
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =5a(5) =6a(6) =12a(7) =35a(8) =83a(9) =231a(10) =918a(11) =2132a(12) =7575a(13) =42734a(14) =132320a(15) =609928a(16) =4694085a(17) =18109624a(18) =113969565a(19) =1148801096a(20) =6065910343a(21) =51213901318
External references
- oeis: A153926