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 A222743 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
 6, 657, 126947, 27397461, 6178897165, 1424636571214, 332960192034230, 78562540663580982, 18671065206165526715, 4462727856303175610197, 1071642436817030793550208, 258331591188039785463763488 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A222747 LINKS R. H. Hardin, Table of n, a(n) for n = 1..99 EXAMPLE Some solutions for n=3 ..0..0..1..0....0..1..1..0....0..1..1..2....0..1..2..2....0..0..1..2 ..2..0..0..1....2..0..1..3....3..3..1..1....0..0..3..1....2..0..0..2 ..2..0..3..2....2..2..1..1....1..0..2..0....2..1..3..3....0..0..1..0 CROSSREFS Sequence in context: A321425 A220858 A337652 * A222720 A309597 A269842 Adjacent sequences:  A222740 A222741 A222742 * A222744 A222745 A222746 KEYWORD nonn AUTHOR R. H. Hardin Mar 04 2013 STATUS approved

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Last modified June 15 12:29 EDT 2021. Contains 345048 sequences. (Running on oeis4.)