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 A206131 Number of (n+1) X 3 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases. 1
 564, 6668, 91924, 1269044, 17521788, 241927532, 3340355572, 46121153588, 636806710044, 8792555155244, 121401086008468, 1676216233423412, 23143951620064572, 319554533544992108, 4412172198832106164 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A206137. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 17*a(n-1) - 47*a(n-2) + 41*a(n-3) - 10*a(n-4) for n > 5. Empirical g.f.: 4*x*(3 - 5*x)*(47 - 165*x + 148*x^2 - 36*x^3) / ((1 - x)*(1 - 16*x + 31*x^2 - 10*x^3)). - Colin Barker, Jun 13 2018 EXAMPLE Some solutions for n=4: 1 0 1 0 2 1 1 2 1 3 1 3 0 2 3 0 3 2 2 1 2 0 1 2 3 0 2 3 0 3 0 3 2 1 3 2 1 0 3 3 2 3 3 0 1 0 1 0 0 2 1 1 0 3 3 2 0 2 1 0 0 3 0 0 1 3 3 0 3 3 0 2 3 1 0 2 3 1 3 2 1 2 1 2 2 3 1 0 1 0 2 3 0 2 0 3 1 2 3 0 3 2 3 2 1 CROSSREFS Cf. A206137. Sequence in context: A252293 A252286 A252285 * A283782 A203781 A189352 Adjacent sequences: A206128 A206129 A206130 * A206132 A206133 A206134 KEYWORD nonn AUTHOR R. H. Hardin, Feb 04 2012 STATUS approved

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Last modified June 9 21:24 EDT 2023. Contains 363183 sequences. (Running on oeis4.)