|
|
A194996
|
|
Number of lower triangles of an n X n 0..6 array with each element differing from all of its horizontal and vertical neighbors by one
|
|
1
|
|
|
7, 22, 114, 888, 10804, 199988, 5740166, 251606900, 17066691742, 1770282323740, 283975401794580, 69694377176377328, 26447798453646675184, 15357128901797793996652, 13788844798416302935620998
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for 4X4
..5........4........2........1........5........4........3........2
..6.5......5.4......3.2......2.3......4.3......5.6......4.5......3.2
..5.4.3....4.5.4....2.1.2....3.4.3....3.4.3....4.5.6....3.4.5....4.3.4
..4.5.4.3..3.4.5.6..1.2.1.0..4.3.2.3..2.3.4.5..5.6.5.4..4.5.6.5..5.4.3.4
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|