Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 5 X 5 X 5 subtriangle.
A153917
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =2a(5) =1a(6) =4a(7) =13a(8) =18a(9) =49a(10) =140a(11) =188a(12) =406a(13) =1769a(14) =3341a(15) =8622a(16) =44447a(17) =84993a(18) =281707a(19) =1724133a(20) =3711938a(21) =16716005a(22) =125407513a(23) =356014822a(24) =1906068709a(25) =17144172762a(26) =59257809503a(27) =359265884506
External references
- oeis: A153917