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 A318011 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
 4, 28, 118, 508, 2130, 8971, 37700, 158613, 667178, 2806643, 11806334, 49664719, 208919728, 878843413, 3696948061, 15551606501, 65419489183, 275194053961, 1157633112776, 4869707055676, 20484941672721, 86172090154282 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A318016. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 3*a(n-1) +5*a(n-2) +3*a(n-4) -4*a(n-5) -11*a(n-6) -6*a(n-7) -a(n-8) -4*a(n-9) -4*a(n-10) -a(n-11) for n>14 EXAMPLE Some solutions for n=5 ..0..0..1. .0..0..1. .0..1..1. .0..0..0. .0..0..0. .0..1..1. .0..0..0 ..0..0..1. .1..1..1. .0..1..1. .1..0..0. .1..1..0. .0..1..0. .0..0..1 ..0..0..1. .1..1..0. .0..0..0. .1..0..0. .1..1..1. .1..0..0. .0..1..1 ..0..0..1. .0..0..1. .0..0..0. .1..1..1. .1..1..1. .1..0..0. .1..1..1 ..1..0..1. .0..1..1. .1..0..1. .0..1..1. .0..0..0. .1..1..1. .1..1..0 CROSSREFS Cf. A318016. Sequence in context: A183469 A058227 A296392 * A328685 A212900 A196514 Adjacent sequences: A318008 A318009 A318010 * A318012 A318013 A318014 KEYWORD nonn AUTHOR R. H. Hardin, Aug 12 2018 STATUS approved

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Last modified February 23 14:24 EST 2024. Contains 370283 sequences. (Running on oeis4.)