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 5 X 5 X 5 subtriangle.
A153918
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 5 X 5 X 5 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =13a(6) =27a(7) =79a(8) =206a(9) =623a(10) =1643a(11) =6478a(12) =21771a(13) =102958a(14) =407720a(15) =2191304a(16) =10858499a(17) =72602092a(18) =437224300a(19) =3520328145a(20) =25109099300a(21) =244666233084
External references
- oeis: A153918