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 A259734 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 or 01010101 1
 20, 36, 190, 868, 4904, 36522, 416107, 4569918, 77901650, 1497446190, 42287505995, 1268416344438, 58326869184327, 2894771753919566, 215057618091485008, 17236097050206624440, 2090654209136652647325, 272722696022344377007246 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A259742 LINKS R. H. Hardin, Table of n, a(n) for n = 1..23 EXAMPLE Some solutions for n=4 ..0..1..0..0..0..1....0..0..1..0..1..0....0..1..0..1..0..0....1..0..1..0..1..0 ..0..0..1..0..1..0....0..0..0..1..0..1....1..0..1..0..1..0....0..1..0..0..0..1 ..0..1..0..1..0..1....1..0..1..0..1..0....0..0..0..1..0..1....0..0..1..0..1..0 ..1..0..1..0..1..0....0..1..0..1..0..1....1..0..1..0..1..0....0..1..0..1..0..1 ..0..1..0..1..0..1....0..0..1..0..0..0....0..1..0..1..0..0....1..0..1..0..1..0 ..0..0..1..0..1..0....0..1..0..1..0..1....0..0..1..0..1..0....0..0..0..1..0..1 CROSSREFS Cf. A259742 Sequence in context: A316098 A308664 A184065 * A294736 A217427 A165442 Adjacent sequences:  A259731 A259732 A259733 * A259735 A259736 A259737 KEYWORD nonn AUTHOR R. H. Hardin, Jul 04 2015 STATUS approved

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Last modified January 17 17:18 EST 2021. Contains 340247 sequences. (Running on oeis4.)