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A195214 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 2 or less and triangles differing by a constant counted only once 2
1, 19, 1047, 176471, 92031109, 149824887097, 764465228592699, 12257873230432791803, 618761146282316127586145, 98449515559059678433241253935, 49416410864494101822050533251357921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A195220

LINKS

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

EXAMPLE

Some solutions for n=5

...0...............0...............0...............0...............0

...2..1...........-2.-1............1..0............0..1............0..1

...0..2..2.........0..0.-1.........0..2..2........-1..1..3.........1..0..0

...2..1..2..1......2..1..1..1......1..1..1..0......1..1..2..1.....-1.-1..1..2

...2..0..1..2..0...1..0..1..3..1...3..3..1..0..1...2..0..2..0..2..-2..0..0..2..2

CROSSREFS

Sequence in context: A136022 A203582 A136021 * A213864 A217827 A098635

Adjacent sequences:  A195211 A195212 A195213 * A195215 A195216 A195217

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 13 2011

STATUS

approved

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Last modified August 12 23:52 EDT 2022. Contains 356077 sequences. (Running on oeis4.)