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 A186931 Number of (n+1) X (n+1) binary arrays with every 2 X 2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock traces. 0
 0, 104, 1840, 59720, 3026432, 264604776, 35582947920, 8132915749352, 2989994168957168 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A186939. LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for 4 X 4 ..1..1..1..1....1..0..0..0....0..0..1..0....0..1..0..1....1..0..1..0 ..1..1..0..0....1..0..0..1....1..0..0..0....0..0..0..1....1..0..1..1 ..1..1..0..0....1..0..0..1....1..0..0..1....1..0..0..0....1..1..1..1 ..1..1..0..0....0..0..0..1....1..0..0..1....0..0..1..1....1..1..0..1 CROSSREFS Cf. A186939. Sequence in context: A223420 A250325 A244946 * A273224 A092714 A297977 Adjacent sequences: A186928 A186929 A186930 * A186932 A186933 A186934 KEYWORD nonn AUTHOR R. H. Hardin Mar 01 2011 STATUS approved

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Last modified March 2 21:08 EST 2024. Contains 370498 sequences. (Running on oeis4.)