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A197660

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

1, 1, 4, 19, 116, 1109, 15390, 312785, 9410767, 416753642, 27195802437, 2617717241482, 371516018279032, 77760873988114592

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OFFSET

1,3

COMMENTS

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

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for 5X5X5

......0..........0..........0..........0..........0..........0..........0

.....0.0........0.0........0.0........4.0........0.4........0.4........0.4

....4.0.0......0.6.0......0.0.0......0.0.4......0.0.0......0.0.0......4.0.0

...0.0.0.0....0.0.0.0....0.0.0.4....0.0.0.0....0.0.6.0....4.0.0.0....0.0.0.0

..0.0.0.4.0..0.0.0.4.0..0.0.4.0.0..0.4.0.4.0..0.4.0.0.0..0.0.0.4.0..0.0.0.4.0

CROSSREFS

Sequence in context: A245505 A247056 A163859 * A354458 A361532 A094822

Adjacent sequences: A197657 A197658 A197659 * A197661 A197662 A197663

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 17 2011

STATUS

approved