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A195229 Number of lower triangles of an n X n 0..5 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less 1
6, 36, 428, 9982, 459880, 42029278, 7640055854, 2767861764930, 2001526172413328, 2892451174381411040, 8361331814456905846790, 48387254396810574882721328, 560941284568012233398098984786, 13033945031291662448750033149621602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A195232

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for n=4

..0........3........0........4........0........2........2........2

..1.1......4.4......1.0......4.4......1.1......1.1......1.2......3.2

..0.1.0....4.3.3....1.0.1....4.5.5....2.1.1....2.1.1....2.2.2....3.3.2

..1.0.1.0..4.4.3.3..1.1.1.2..4.4.5.5..2.1.1.1..2.1.1.2..3.3.2.1..2.3.2.2

CROSSREFS

Sequence in context: A077704 A185085 A201540 * A339300 A296389 A077290

Adjacent sequences:  A195226 A195227 A195228 * A195230 A195231 A195232

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 13 2011

STATUS

approved

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Last modified June 16 18:25 EDT 2021. Contains 345066 sequences. (Running on oeis4.)