Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,2 5,3 5,4 6,3 polyhexes in any orientation on a planar n X n X n triangular grid.
A155420
Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,2 5,3 5,4 6,3 polyhexes in any orientation on a planar n X n X n triangular grid.
Terms
- a(0) =1a(1) =7a(2) =19a(3) =37a(4) =67a(5) =234a(6) =1126a(7) =6422a(8) =32270a(9) =161586a(10) =990365a(11) =7766402a(12) =74447984a(13) =789199485a(14) =8923308481
External references
- oeis: A155420