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 A222884 Number of nX1 0..2 arrays with exactly floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order 5
 1, 0, 0, 6, 16, 16, 40, 280, 768, 1440, 3808, 16352, 45056, 111104, 300672, 1072512, 2959360, 8281600, 22668800, 74866176, 206880768, 614068224, 1691502592, 5409544192, 14973206528, 45696688128, 126360084480, 398896128000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Column 1 of A222889 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE All.solutions.for.n=4.. ..0....0....0....0....0....0 ..0....1....0....1....1....1 ..1....1....1....0....2....1 ..2....0....0....0....2....2 CROSSREFS Sequence in context: A291795 A301831 A183127 * A230949 A231023 A217186 Adjacent sequences:  A222881 A222882 A222883 * A222885 A222886 A222887 KEYWORD nonn AUTHOR R. H. Hardin Mar 08 2013 STATUS approved

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Last modified January 17 23:51 EST 2022. Contains 350410 sequences. (Running on oeis4.)