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

43, 493, 4069, 30608, 229869, 1782111, 14399939, 121414559, 1066897441, 9753094999, 92586232382, 911156698994

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