Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 6 ones in any 5 X 5 X 5 subtriangle.
A153952
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 6 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =5a(5) =8a(6) =11a(7) =40a(8) =59a(9) =169a(10) =555a(11) =1319a(12) =3615a(13) =20488a(14) =46826a(15) =218870a(16) =1193201a(17) =4783860a(18) =22240814a(19) =199704231a(20) =805091958a(21) =6227071279a(22) =56791304489a(23) =381075628434
External references
- oeis: A153952