Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 14 ones in any 5 X 5 X 5 subtriangle.
A154005
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 14 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =8a(5) =15a(6) =31a(7) =126a(8) =240a(9) =943a(10) =3992a(11) =15073a(12) =60221a(13) =508875a(14) =1923344a(15) =15346988a(16) =129704729a(17) =978528991a(18) =7823328579a(19) =131906890104a(20) =997545267990
External references
- oeis: A154005