A155322 - OEIS

A155322

Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.

%I #3 Mar 31 2012 12:35:22

%S 1,4,10,19,46,199,890,4075,20900,140127,1098924,9985570,103452546,

%T 1269141243,18318539114,311054175156,6154670827141

%N Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 9 X 9 X 9 example

%e ...........0

%e ..........0.0

%e .........0.1.1

%e ........1.1.1.0

%e .......1.1.0.0.1

%e ......0.0.0.0.1.1

%e .....1.1.0.0.0.1.0

%e ....0.1.1.1.0.1.1.0

%e ...0.0.0.1.1.0.1.0.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009