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 A200573 Number of n X 2 0..2 arrays with no average of any element and its horizontal and vertical neighbors equal to one. 1
 6, 36, 174, 922, 5202, 29180, 163706, 919924, 5171420, 29068726, 163403454, 918546962, 5163485576, 29025793202, 163164480016, 917206531060, 5155949803838, 28983459159770, 162926511803678, 915868877073788 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 Robert Israel, Maple-assisted proof of empirical formula FORMULA Empirical: a(n) = 5*a(n-1) +8*a(n-2) -20*a(n-3) -23*a(n-4) -52*a(n-5) +25*a(n-6) +254*a(n-7) +62*a(n-8) -134*a(n-9) -88*a(n-10) -360*a(n-11) +176*a(n-12) -168*a(n-13) +184*a(n-14). Empirical formula confirmed by Robert Israel, Jun 28 2018 (see link). EXAMPLE Some solutions for n=5 ..1..2....2..0....1..1....0..1....2..0....2..2....2..1....0..0....0..1....2..1 ..2..2....0..0....2..2....1..0....0..2....0..1....2..2....1..1....0..0....2..2 ..0..1....0..0....1..2....0..1....2..0....0..2....0..0....0..0....2..2....1..0 ..0..2....1..2....0..0....0..1....1..2....1..0....1..1....1..0....2..2....0..0 ..0..0....2..2....2..0....0..0....2..2....2..2....1..0....2..2....2..1....1..1 CROSSREFS Column 2 of A200579. Sequence in context: A213294 A293886 A132165 * A224130 A283197 A218265 Adjacent sequences:  A200570 A200571 A200572 * A200574 A200575 A200576 KEYWORD nonn AUTHOR R. H. Hardin, Nov 19 2011 STATUS approved

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Last modified December 3 21:17 EST 2021. Contains 349468 sequences. (Running on oeis4.)