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A182367 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor 0
1, 3, 67, 21350, 147512732, 30761087800216 (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

..1.2......1.2......1.1......1.2......1.2......1.2......0.1......0.1

..1.2.1....3.3.4....2.3.4....0.3.0....0.3.3....3.2.3....0.2.2....2.3.4

..3.2.4.0..4.5.1.2..5.3.6.0..2.1.1.3..4.5.6.7..3.1.4.0..0.3.0.1..2.5.0.6

CROSSREFS

Sequence in context: A186208 A217625 A238316 * A091872 A079320 A283882

Adjacent sequences:  A182364 A182365 A182366 * A182368 A182369 A182370

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 26 2012

STATUS

approved

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Last modified February 21 01:09 EST 2019. Contains 320364 sequences. (Running on oeis4.)