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A194995
Number of lower triangles of an n X n 0..5 array with each element differing from all of its horizontal and vertical neighbors by one
1
6, 18, 90, 672, 7858, 138956, 3816148, 159427052, 10305467946, 1016480307410, 154783529107972, 36032460970618398, 12930394865167766832, 7102572782942842968972, 6007897214058607933844528
OFFSET
1,1
COMMENTS
Column 5 of A194998
LINKS
EXAMPLE
Some solutions for 4X4
..1........4........2........1........1........3........2........4
..2.3......3.4......3.4......2.3......2.1......4.5......3.2......5.4
..3.2.1....4.3.4....2.3.2....3.2.3....1.2.3....5.4.3....2.3.4....4.3.2
..4.3.2.1..5.4.3.2..3.4.3.4..4.3.4.3..2.1.2.1..4.5.4.5..3.4.5.4..3.2.1.0
CROSSREFS
Sequence in context: A279260 A371987 A294471 * A104970 A216727 A174075
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 07 2011
STATUS
approved