A194782 Number of lower triangles of a (2n+2)X(2n+2) 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

12, 95, 655, 4464, 31429, 231395, 1784723, 14404136, 121420974, 1066906857, 9753108365, 92586250829, 911156723851

Offset

1,1

Comments

Row 4 of A194778

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=2 containing a 2
..0............0............0............0............0............0
..1.1..........0.0..........0.0..........0.0..........0.0..........1.1
..1.1.1........1.1.1........1.1.1........0.0.0........0.0.0........1.1.1
..0.0.0.0......1.1.1.1......1.1.1.1......0.0.0.1......1.1.1.1......1.1.1.2
..0.0.0.0.0....1.1.1.1.1....1.1.1.1.1....0.0.0.1.1....1.1.1.1.1....1.1.1.2.2
..2.2.2.2.2.2..2.2.2.2.2.2..1.1.1.1.1.2..0.0.0.1.1.2..1.1.1.1.1.2..1.1.1.2.2.0

Crossrefs

Sequence in context: A026860 A021074 A027250 * A059154 A204630 A192848

Adjacent sequences: A194779 A194780 A194781 * A194783 A194784 A194785

Keyword

nonn

Author

R. H. Hardin Sep 02 2011

Status

approved