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 A202790 Number of n X 3 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically. 1
 4, 50, 398, 3018, 23436, 182430, 1417772, 11017196, 85621362, 665418194, 5171353118, 40189602848, 312336995590, 2427354106352, 18864392868124, 146606264807250, 1139363300400646, 8854660691296250, 68814763405175276 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A202795. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 7*a(n-1) +2*a(n-2) +29*a(n-3) +16*a(n-4). Empirical g.f.: 2*x*(2 + 11*x + 20*x^2 + 8*x^3) / (1 - 7*x - 2*x^2 - 29*x^3 - 16*x^4). - Colin Barker, Jun 01 2018 EXAMPLE Some solutions for n=5: ..1..0..1....1..0..0....1..0..0....1..1..0....1..1..0....1..1..1....0..1..0 ..1..1..0....0..1..0....1..1..0....1..0..1....1..0..1....1..0..0....0..1..1 ..0..1..0....1..1..0....1..1..1....1..1..0....1..1..0....1..1..1....1..1..0 ..1..1..0....0..1..0....0..1..0....1..1..0....1..1..1....1..1..0....1..1..0 ..0..0..1....0..1..0....1..0..0....0..1..0....1..0..0....0..1..0....0..1..1 CROSSREFS Cf. A202795. Sequence in context: A240396 A197473 A219566 * A231833 A028455 A232731 Adjacent sequences: A202787 A202788 A202789 * A202791 A202792 A202793 KEYWORD nonn AUTHOR R. H. Hardin, Dec 24 2011 STATUS approved

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Last modified March 28 17:12 EDT 2023. Contains 361596 sequences. (Running on oeis4.)