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
Keywords
Examples
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
Links
- R. H. Hardin, Table of n, a(n) for n = 1..200
Formula
Empirical: a(n) = 149824887097*n - 417651128341 for n>8
Comments