A195247 Number of lower triangles of an n X n 0..7 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

8, 122, 5870, 886084, 421064386, 631149414120, 2987571816007840, 44691981426014450274, 2113939963847059814381026, 316271939439306387096992492956, 149706956331711946010383809151524932

Offset

1,1

Comments

Column 7 of A195248

Links

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

Example

Some solutions for n=5
..0..........1..........6..........0..........7..........4..........4
..1.2........3.3........5.5........0.2........5.6........4.6........6.6
..2.1.1......2.1.3......6.6.7......1.1.2......4.6.7......5.5.4......5.4.5
..0.0.2.2....3.3.3.4....7.7.7.6....2.0.1.0....5.5.7.5....7.6.6.4....4.4.3.4
..0.1.0.1.1..2.3.3.2.2..7.7.7.6.4..1.0.2.0.2..4.5.7.7.5..6.6.5.4.3..4.3.2.3.2

Crossrefs

Sequence in context: A359355 A349525 A240477 * A239755 A264408 A364985

Adjacent sequences: A195244 A195245 A195246 * A195248 A195249 A195250

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved