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A194783
Number of lower triangles of a (2n+3)X(2n+3) 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
23, 219, 1641, 11686, 84727, 639325, 5044981, 41614291, 358184223, 3210665949, 29914282858, 289187619416
OFFSET
1,1
COMMENTS
Row 5 of A194778
EXAMPLE
Some solutions for n=2 containing a 2
..0..............0..............0..............0..............0
..1.1............1.1............1.1............0.0............1.1
..1.1.2..........1.1.1..........1.1.1..........0.0.0..........1.1.1
..1.1.2.2........1.1.1.1........1.1.1.1........0.0.0.0........2.2.2.2
..1.1.2.2.2......1.1.1.1.1......1.1.1.1.1......0.0.0.0.1......2.2.2.2.1
..1.1.2.2.2.2....2.2.2.2.2.2....2.2.2.2.2.2....0.0.0.0.1.1....2.2.2.2.1.1
..1.1.2.2.2.2.2..2.2.2.2.2.2.2..2.2.2.2.2.2.1..0.0.0.0.1.1.2..2.2.2.2.1.1.0
CROSSREFS
Sequence in context: A201831 A027481 A201211 * A254870 A110028 A117608
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 02 2011
STATUS
approved