The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #3 Mar 31 2012 12:35:22
%S 1,7,25,55,208,1150,9013,76658,703883,8056303,122331252,2348850844,
%T 54143239435
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 12 X 12 X 12 example
%e ..............0
%e .............0.0
%e ............1.1.1
%e ...........1.0.0.0
%e ..........0.1.0.0.1
%e .........0.1.0.0.0.1
%e ........0.0.0.0.0.0.1
%e .......1.0.0.1.0.1.1.0
%e ......1.0.0.1.0.1.0.0.0
%e .....1.0.0.1.0.0.0.0.1.1
%e ....0.1.1.0.1.1.0.1.1.0.1
%e ...0.0.0.1.0.0.1.0.0.0.0.1
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009