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 A223107 Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
 0, 280, 13416, 737254, 40395409, 2222762597, 123093376161, 6858519798139, 384184470564745, 21618570758835696, 1221246943086629366, 69219708062618487810, 3934674396591601892887, 224222135757151794516896 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A223104 LINKS R. H. Hardin, Table of n, a(n) for n = 1..25 EXAMPLE Some solutions for n=3 ..0..1..2....0..1..1....0..0..1....0..1..2....0..1..0....0..0..1....0..1..2 ..1..2..0....0..1..0....1..0..2....2..2..0....0..0..0....1..0..1....0..2..1 ..0..1..0....0..1..0....1..2..1....2..1..2....2..1..0....2..1..1....0..0..1 ..1..2..1....2..2..2....0..2..2....1..0..1....1..2..1....1..2..1....1..0..0 CROSSREFS Sequence in context: A297724 A024214 A094895 * A218411 A272715 A282439 Adjacent sequences:  A223104 A223105 A223106 * A223108 A223109 A223110 KEYWORD nonn AUTHOR R. H. Hardin Mar 14 2013 STATUS approved

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Last modified February 18 09:39 EST 2020. Contains 332011 sequences. (Running on oeis4.)