A195252 Number of lower triangles of a 6X6 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

2097152, 10460353203, 74236765958, 192172956591, 333437946202, 481573562101, 631149414120, 780949393809, 930772855532, 1080597742629, 1230422629726, 1380247516823, 1530072403920, 1679897291017, 1829722178114, 1979547065211

Offset

1,1

Comments

Row 6 of A195248

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n) = 149824887097*n - 417651128341 for n>8

Example

Some solutions for n=5
..1............0............2............1............5............4
..1.3..........0.1..........1.3..........0.2..........4.3..........4.2
..2.2.2........1.2.0........3.3.5........0.1.0........2.4.2........3.4.3
..3.4.4.2......2.1.0.0......2.4.3.4......1.1.2.0......4.3.2.0......2.2.2.2
..2.3.2.3.4....0.0.1.1.1....2.2.2.2.3....0.2.0.0.2....5.4.2.2.2....0.1.0.0.1
..3.2.3.2.4.3..1.2.2.3.2.0..0.1.3.3.3.1..1.1.2.1.2.2..3.4.3.2.2.0..1.1.2.2.1.1

Crossrefs

Sequence in context: A017371 A017491 A017623 * A017706 A010809 A323659

Adjacent sequences: A195249 A195250 A195251 * A195253 A195254 A195255

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved