A195246 Number of lower triangles of an n X n 0..6 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

7, 103, 4823, 709613, 329060365, 481573562101, 2226347741716207, 32533092875899015419, 1503300467938958707014579, 219724247440207348239797551059, 101603289677502667519178169906161081

Offset

1,1

Comments

Column 6 of A195248

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=5
..2..........0..........4..........4..........2..........4..........1
..4.4........2.2........3.5........4.6........1.3........3.2........0.1
..5.6.4......4.4.3......4.5.4......5.6.6......1.3.2......4.3.1......0.2.1
..4.6.6.6....2.2.4.4....3.3.4.4....6.6.6.4....2.2.1.0....2.2.2.3....0.1.0.0
..4.6.5.5.6..4.4.3.4.3..3.2.3.4.2..5.4.5.6.6..0.2.0.1.2..0.1.1.3.1..1.2.2.0.1

Crossrefs

Sequence in context: A101746 A318398 A318815 * A280644 A322646 A224706

Adjacent sequences: A195243 A195244 A195245 * A195247 A195248 A195249

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved