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A182070 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, diagonal or antidiagonal neighbor 0
1, 2, 35, 8292, 43324498, 7006657352045 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

Some solutions for n=4

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

..0.1......1.2......1.2......1.2......1.2......1.2......1.2......0.1

..2.3.4....1.0.3....3.4.1....0.3.4....3.4.5....1.3.0....3.4.1....2.1.3

..1.3.4.2..1.4.1.4..2.4.5.3..1.3.1.2..5.4.5.2..4.3.1.2..5.0.1.5..0.1.2.0

CROSSREFS

Sequence in context: A132100 A327129 A291809 * A325630 A292702 A133013

Adjacent sequences:  A182067 A182068 A182069 * A182071 A182072 A182073

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 26 2012

STATUS

approved

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Last modified January 27 09:01 EST 2020. Contains 331293 sequences. (Running on oeis4.)