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 A183435 Number of n X 2 binary arrays with every 1 having exactly one king-move neighbor equal to 1. 2
 2, 7, 13, 28, 69, 149, 330, 755, 1681, 3756, 8457, 18937, 42418, 95183, 213349, 478204, 1072285, 2403885, 5388986, 12082011, 27086537, 60724492, 136139073, 305209713, 684246754, 1534012759, 3439098365, 7710098140, 17285247541, 38751739141 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A183442. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = a(n-1) + a(n-2) + 4*a(n-3). Empirical g.f.: x*(2 + 5*x + 4*x^2) / (1 - x - x^2 - 4*x^3). - Colin Barker, Feb 27 2018 EXAMPLE Some solutions for 3 X 2: 1 1 0 1 1 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 1 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 0 0 1 1 CROSSREFS Cf. A183442. Sequence in context: A182415 A275491 A360673 * A360385 A141777 A297883 Adjacent sequences: A183432 A183433 A183434 * A183436 A183437 A183438 KEYWORD nonn AUTHOR R. H. Hardin, Jan 04 2011 STATUS approved

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Last modified March 30 16:58 EDT 2023. Contains 361622 sequences. (Running on oeis4.)