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A212024 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, and containing the value n(n+1)/2-5 0
0, 0, 35, 4785, 440660, 14245030, 231475447, 2383699176, 17770342627 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A212026

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

..0.3.4....3.4.3....3.4.1....0.2.3....3.2.0....3.4.0....3.4.5....0.3.4

..1.5.0.1..5.6.3.6..3.0.1.5..4.5.3.5..3.4.3.5..2.5.2.1..2.6.7.2..5.6.7.0

CROSSREFS

Sequence in context: A294851 A266053 A115963 * A231914 A202067 A336306

Adjacent sequences:  A212021 A212022 A212023 * A212025 A212026 A212027

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 26 2012

STATUS

approved

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)