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 A208874 Number of 3Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
 5, 143, 6520, 307165, 14493405, 683903931, 32271626438, 1522813452263, 71857577327143, 3390770839381669, 160001593732718856, 7550056082308516761, 356267369073405009281, 16811323900505484274607, 793282337427660173475274 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A208872 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 61*a(n-1) -722*a(n-2) +3476*a(n-3) -7851*a(n-4) +8583*a(n-5) -4266*a(n-6) +720*a(n-7) for n>8 EXAMPLE Some solutions for n=4 ..0..1..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0 ..2..2..1..2....1..1..1..2....1..2..2..1....1..1..1..0....1..1..1..0 ..1..2..3..2....2..0..1..3....1..0..1..2....0..0..1..1....2..2..3..2 CROSSREFS Sequence in context: A066264 A171776 A277401 * A222289 A134503 A282836 Adjacent sequences: A208871 A208872 A208873 * A208875 A208876 A208877 KEYWORD nonn AUTHOR R. H. Hardin Mar 02 2012 STATUS approved

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Last modified June 4 02:25 EDT 2023. Contains 363118 sequences. (Running on oeis4.)