Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with every one adjacent to exactly 2 other ones.
A153986
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with every one adjacent to exactly 2 other ones.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =2a(5) =4a(6) =9a(7) =15a(8) =37a(9) =88a(10) =191a(11) =729a(12) =2246a(13) =6555a(14) =31434a(15) =144150a(16) =601688a(17) =3970089a(18) =24322158a(19) =135488789a(20) =1251604698a(21) =10410417129a(22) =79632436378a(23) =997602199170
External references
- oeis: A153986