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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A194778

LINKS

Table of n, a(n) for n=1..12.

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

Adjacent sequences:  A194781 A194782 A194783 * A194785 A194786 A194787

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 02 2011

STATUS

approved

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Last modified March 23 04:46 EDT 2019. Contains 321422 sequences. (Running on oeis4.)