Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 3 X 3 X 3 subtriangle.
A153900
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 3 X 3 X 3 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =5a(5) =10a(6) =18a(7) =48a(8) =97a(9) =299a(10) =769a(11) =2879a(12) =9061a(13) =41454a(14) =154622a(15) =857522a(16) =3902066a(17) =26137942a(18) =144826739a(19) =1177942368a(20) =7878440446a(21) =77715100928a(22) =630332738835
External references
- oeis: A153900