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 A234891 Number of (n+1)X(1+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
 160, 760, 3456, 16572, 76032, 365024, 1676576, 8050184, 36980544, 177566656, 815714624, 3916758000, 17993056384, 86395956032, 396891522944, 1905725225888, 8754648687872, 42036560942336, 193110382571776, 927244100524992 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A234898 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 30*a(n-2) -194*a(n-4) +428*a(n-6) -288*a(n-8) +48*a(n-10) EXAMPLE Some solutions for n=5 ..6..2....3..5....5..1....4..0....4..5....6..3....4..6....2..3....4..2....0..2 ..4..1....2..3....3..0....6..3....0..2....5..1....0..1....0..2....3..0....3..6 ..6..4....0..2....6..2....2..0....2..3....6..3....2..4....2..3....4..2....2..4 ..5..2....4..5....3..0....6..3....0..2....3..1....3..6....0..2....2..1....5..6 ..2..0....0..2....4..2....3..1....1..4....6..3....0..2....5..6....5..3....2..4 ..4..3....3..6....1..0....5..2....3..5....2..0....4..5....2..4....2..1....3..6 CROSSREFS Sequence in context: A234658 A234651 A234898 * A305272 A234450 A234444 Adjacent sequences:  A234888 A234889 A234890 * A234892 A234893 A234894 KEYWORD nonn AUTHOR R. H. Hardin, Jan 01 2014 STATUS approved

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Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)