Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 3 X 3 X 3 subtriangle.
A153930
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 3 X 3 X 3 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =13a(4) =45a(5) =293a(6) =1880a(7) =22810a(8) =274047a(9) =6160861a(10) =137419960a(11) =5755708030a(12) =238764714329
External references
- oeis: A153930