A194774 Number of lower triangles of an (n+6)X(n+6) 0..4 array with new values introduced in row major order 0..4 and no element unequal to more than one horizontal or vertical neighbor

268, 672, 1736, 4464, 11686, 30608, 80961, 214469, 570921, 1521287, 4061881, 10847647, 28982750, 77406210, 206655490, 551301206, 1469565060, 3913609398, 10412354243, 27674510615, 73480819187, 194908131709, 516485443463

Offset

1,1

Comments

Column 4 of A194778

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

All solutions for 7X7 including a 4
..0..............0..............0
..1.1............1.1............1.1
..1.1.2..........1.1.1..........1.1.1
..1.1.2.2........2.2.2.2........2.2.2.2
..1.1.2.2.3......2.2.2.2.2......2.2.2.2.3
..1.1.2.2.3.3....3.3.3.3.3.3....2.2.2.2.3.3
..1.1.2.2.3.3.4..3.3.3.3.3.3.4..2.2.2.2.3.3.4

Crossrefs

Sequence in context: A096613 A304388 A234878 * A279184 A237228 A190352

Adjacent sequences: A194771 A194772 A194773 * A194775 A194776 A194777

Keyword

nonn

Author

R. H. Hardin Sep 02 2011

Status

approved