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A194784
Number of lower triangles of a (2n+4)X(2n+4) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor
0
43, 493, 4069, 30608, 229869, 1782111, 14399939, 121414559, 1066897441, 9753094999, 92586232382, 911156698994
OFFSET
1,1
COMMENTS
Row 6 of A194778
EXAMPLE
Some solutions for n=2 containing a 2
..0................0................0................0
..1.1..............0.0..............1.1..............0.0
..1.1.1............0.0.0............1.1.1............0.0.0
..1.1.1.1..........1.1.1.1..........2.2.2.2..........1.1.1.1
..1.1.1.1.1........1.1.1.1.1........2.2.2.2.0........1.1.1.1.0
..1.1.1.1.1.1......2.2.2.2.2.2......2.2.2.2.0.0......1.1.1.1.0.0
..1.1.1.1.1.1.1....2.2.2.2.2.2.2....2.2.2.2.0.0.0....1.1.1.1.0.0.2
..1.1.1.1.1.1.1.2..2.2.2.2.2.2.2.2..2.2.2.2.0.0.0.2..1.1.1.1.0.0.2.2
CROSSREFS
Sequence in context: A248206 A140849 A188133 * A184153 A184145 A238202
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 02 2011
STATUS
approved