Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 3 X 3 X 3 subtriangle.
A153921
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 3 X 3 X 3 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =148a(6) =714a(7) =6039a(8) =49623a(9) =697824a(10) =9570390a(11) =228608398a(12) =5268376882a(13) =211052632687
External references
- oeis: A153921