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 A303883 Number of nX3 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero. 2
 1, 8, 11, 36, 87, 256, 684, 1932, 5308, 14809, 41025, 114088, 316733, 880136, 2444724, 6792145, 18868672, 52420409, 145629432, 404580097, 1123976982, 3122570154, 8674939898, 24100237936, 66953936965, 186007780911, 516756709968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A303888. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 3*a(n-1) +3*a(n-2) -10*a(n-3) +4*a(n-5) -16*a(n-6) +5*a(n-7) +17*a(n-8) -5*a(n-9) +3*a(n-10) +7*a(n-11) +7*a(n-12) +9*a(n-13) +3*a(n-14) +5*a(n-15) +2*a(n-16) for n>18 EXAMPLE Some solutions for n=5 ..0..1..0. .0..1..0. .0..0..1. .0..1..0. .0..0..1. .0..0..1. .0..1..1 ..1..0..1. .1..1..0. .1..1..0. .0..1..0. .0..0..1. .1..1..0. .0..1..1 ..1..0..0. .1..0..1. .1..1..1. .1..1..1. .1..1..0. .1..1..0. .0..1..1 ..0..0..1. .0..0..0. .1..1..0. .0..1..0. .0..1..1. .0..0..1. .0..1..1 ..1..1..0. .1..0..1. .1..1..0. .1..0..1. .0..1..0. .0..0..1. .1..0..0 CROSSREFS Cf. A303888. Sequence in context: A160796 A160416 A056873 * A304889 A192427 A258285 Adjacent sequences:  A303880 A303881 A303882 * A303884 A303885 A303886 KEYWORD nonn AUTHOR R. H. Hardin, May 02 2018 STATUS approved

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Last modified December 5 15:11 EST 2019. Contains 329753 sequences. (Running on oeis4.)