Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with every one adjacent to exactly 1 other one.
A153982
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with every one adjacent to exactly 1 other one.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =6a(6) =11a(7) =30a(8) =72a(9) =201a(10) =747a(11) =2553a(12) =10966a(13) =58566a(14) =287270a(15) =1751705a(16) =13247679a(17) =91522060a(18) =788765512a(19) =8490555128a(20) =84280981845
External references
- oeis: A153982