A195218 Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 6 or less and triangles differing by a constant counted only once

1, 127, 117585, 845613769, 47764170577925, 21369796486647028143, 76019997788404353762724447, 2155668406192527252815282495516543

Offset

1,2

Comments

Column 6 of A195220

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
...0...............0...............0...............0...............0
..-4.-4...........-5..0...........-1..3............6..0............6..1
...1..2..0........-5..0.-4........-1..4..1.........2..3..6.........2..2.-4
..-2.-1..2..5......0.-4..1.-2.....-1..5..2.-4.....-2..0..1..2......6..0.-3.-1
..-6.-2.-1..0..2...2..1..0.-5.-1...0..5.-1..0.-5..-6..0..3..4..5...3..1..0.-4.-1

Crossrefs

Sequence in context: A217914 A203798 A351134 * A215692 A212860 A334668

Adjacent sequences: A195215 A195216 A195217 * A195219 A195220 A195221

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved