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A182326 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor 0
1, 1, 10, 1744, 7122884, 932561028624 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

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

..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2

..3.0.4....0.3.4....3.0.1....3.4.3....0.3.4....3.4.5....3.0.1....0.3.1

..5.1.2.5..5.6.2.0..2.4.3.5..2.0.2.1..1.5.2.5..0.6.7.0..4.5.6.2..4.5.2.5

CROSSREFS

Sequence in context: A232594 A194793 A211915 * A160303 A336666 A024138

Adjacent sequences:  A182323 A182324 A182325 * A182327 A182328 A182329

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 24 2012

STATUS

approved

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Last modified August 16 07:50 EDT 2022. Contains 356160 sequences. (Running on oeis4.)