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A195227 Number of lower triangles of an n X n 0..3 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less 1
4, 22, 246, 5428, 237818, 20729610, 3601738548, 1249159521262, 865793424024974, 1200356073563114252, 3331551471246807302142, 18523112376180844925948966, 206425939461681776649215679048, 4613382950875473008207859661034814 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A195232

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for n=4

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

..3.2......3.2......1.1......1.2......1.0......2.3......1.0......0.1

..2.2.2....3.2.1....1.2.1....1.1.2....1.0.1....3.3.3....0.0.1....1.0.0

..3.2.3.3..2.2.2.1..2.2.2.1..1.2.1.1..1.0.1.2..3.3.2.3..1.0.1.0..1.0.0.1

CROSSREFS

Sequence in context: A137158 A025135 A125801 * A265908 A119009 A326883

Adjacent sequences:  A195224 A195225 A195226 * A195228 A195229 A195230

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 13 2011

STATUS

approved

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Last modified September 22 16:50 EDT 2020. Contains 337291 sequences. (Running on oeis4.)