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 A304305 Number of n X 3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. 1
 4, 23, 77, 261, 918, 3270, 11739, 42286, 152593, 551277, 1992676, 7204835, 26054060, 94223657, 340770353, 1232459982, 4457471732, 16121551990, 58307765439, 210885454206, 762723638858, 2758595178785, 9977203623515, 36085252551736 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A304310. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) +a(n-2) -6*a(n-3) -11*a(n-4) +2*a(n-5) +14*a(n-6) -6*a(n-7) -7*a(n-8) +15*a(n-9) +22*a(n-10) -6*a(n-11) -7*a(n-12) +a(n-13) +3*a(n-14) -10*a(n-15) -8*a(n-16). EXAMPLE Some solutions for n=5 ..0..0..0. .0..0..0. .0..0..1. .0..1..0. .0..1..1. .0..1..1. .0..1..0 ..1..1..1. .1..0..1. .0..0..0. .1..0..1. .0..0..1. .0..1..0. .1..1..1 ..1..1..1. .0..0..0. .0..0..0. .1..1..0. .0..0..0. .1..0..0. .0..1..1 ..0..1..1. .0..0..0. .0..1..1. .0..0..0. .0..0..0. .0..1..0. .0..0..1 ..1..1..0. .0..0..1. .1..1..0. .0..0..1. .0..0..1. .1..0..1. .1..0..1 CROSSREFS Cf. A304310. Sequence in context: A226342 A071246 A219933 * A316204 A305771 A219465 Adjacent sequences: A304302 A304303 A304304 * A304306 A304307 A304308 KEYWORD nonn AUTHOR R. H. Hardin, May 10 2018 STATUS approved

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Last modified July 23 07:34 EDT 2024. Contains 374546 sequences. (Running on oeis4.)