Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 11 ones in any 5 X 5 X 5 subtriangle.
A153996
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 11 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =8a(5) =12a(6) =26a(7) =101a(8) =183a(9) =703a(10) =2877a(11) =10411a(12) =40654a(13) =329616a(14) =1193895a(15) =9029186a(16) =73784076a(17) =520396717a(18) =3984125165a(19) =63450006981a(20) =453313410587
External references
- oeis: A153996