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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 May 26 10:56 EDT 2024. Contains 372824 sequences. (Running on oeis4.)