Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 4 X 4 X 4 subtriangle.
A153915
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 4 X 4 X 4 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =23a(6) =56a(7) =204a(8) =561a(9) =2634a(10) =9589a(11) =57271a(12) =263195a(13) =2051213a(14) =12518144a(15) =126095265a(16) =984855718a(17) =12768865644a(18) =128552370071
External references
- oeis: A153915