|
|
A268797
|
|
Number of nX7 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
|
|
1
|
|
|
576, 4360, 41248, 561116, 7801688, 104971262, 1384570516, 17967375416, 230262982692, 2921020155826, 36745483472428, 459003330021886, 5699362152372404, 70403795917829390, 865796392149477244
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical recurrence of order 68 (see link above)
|
|
EXAMPLE
|
Some solutions for n=3
..2..2..1..2..2..2..2. .1..2..2..2..2..1..2. .2..2..2..1..1..2..2
..1..2..2..2..1..2..1. .2..1..2..2..2..2..2. .1..2..2..2..2..2..2
..2..1..2..1..2..2..2. .1..2..2..2..1..2..2. .2..1..2..2..2..1..2
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|