A195244 Number of lower triangles of an n X n 0..4 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

5, 65, 2729, 357847, 147824001, 192172956591, 786909681200387, 10151817642632605643, 412697709382902984293947, 52873327059079066189496492173, 21349480944940442832764307444766199

Offset

1,1

Comments

Column 4 of A195248

Links

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

Example

Some solutions for n=5
..0..........4..........3..........0..........3..........4..........4
..2.0........3.3........1.3........2.2........2.3........4.2........4.4
..2.0.1......2.2.2......1.2.2......4.3.1......4.2.3......4.2.0......2.4.4
..0.2.0.2....0.2.0.1....1.1.2.4....4.3.2.3....2.3.3.3....4.2.0.0....3.3.3.3
..0.1.2.2.1..0.2.2.1.1..1.3.3.4.3..3.3.2.3.2..4.3.1.2.4..3.2.1.2.0..1.3.1.2.1

Crossrefs

Sequence in context: A196975 A247540 A171800 * A162080 A012476 A195516

Adjacent sequences: A195241 A195242 A195243 * A195245 A195246 A195247

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved