

A195213


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 1 or less and triangles differing by a constant counted only once


2



1, 7, 91, 2277, 111031, 10654607, 2021888119, 761408842173, 570411420721871, 851650667866314005, 2537743716708476573853, 15108768742290768272235707, 179885152873727967922701202921, 4286156683596201247493358770260469
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OFFSET

1,2


COMMENTS

Column 1 of A195220


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16


EXAMPLE

Some solutions for n=5
...0...............0...............0...............0...............0
...1..0...........1.1...........1..0...........1..0............1..1
...0..0..1........2.2.1........1..0..1.........0..0.1.........0..1..0
...0..1..1..1.....1.1.1.2......0..0..0..1......1..0.1.2......0..1..1..0
...1..0..1..0..0..1.1.2.1.2...0..0..1..1..2...1..0.1.2.1...0..0..1..1..0


CROSSREFS

Sequence in context: A177784 A326266 A124557 * A317370 A282041 A027955
Adjacent sequences: A195210 A195211 A195212 * A195214 A195215 A195216


KEYWORD

nonn


AUTHOR

R. H. Hardin Sep 13 2011


STATUS

approved



