

A197650


Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 1,3,4,6,0,2,6 for x=0,1,2,3,4,5,6


0



1, 1, 4, 18, 89, 914, 14965, 321510, 12712330, 879485238, 102013590235, 20591125917598, 6951014585410261
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OFFSET

1,3


COMMENTS

Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 4's, every 3 is next to 3 6's, every 4 is next to 4 0's, every 5 is next to 5 2's, every 6 is next to 6 6's


LINKS

Table of n, a(n) for n=1..13.


EXAMPLE

Some solutions for 5X5X5
......0..........0..........0..........0..........0..........0..........0
.....0.0........0.4........4.0........4.0........0.0........0.0........4.0
....2.4.0......4.0.0......0.0.4......0.0.0......0.0.0......0.0.4......0.0.0
...0.4.0.0....0.0.0.0....4.0.0.0....4.0.0.0....0.0.0.4....0.0.0.0....0.0.0.4
..0.0.0.0.0..0.4.0.4.0..0.0.0.4.0..0.0.0.0.0..0.4.0.0.0..0.4.0.0.0..0.0.0.0.0


CROSSREFS

Sequence in context: A000305 A200029 A020070 * A036749 A218760 A219305
Adjacent sequences: A197647 A197648 A197649 * A197651 A197652 A197653


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 16 2011


STATUS

approved



