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 A261257 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101. 1
 36, 52, 288, 1918, 11733, 85506, 1062118, 13599460, 242945986, 5120328922, 155899484972, 5208071829848, 253966207382266, 14042932506665452, 1114055271066551642, 99140006022295429922, 12815515680476819645301 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A261265. LINKS R. H. Hardin, Table of n, a(n) for n = 1..22 EXAMPLE Some solutions for n=4 ..0..1..0..1..0..0....0..1..0..0..0..1....0..0..0..1..0..1....1..0..1..0..0..0 ..0..0..1..0..1..0....0..0..1..0..1..0....1..0..1..0..0..0....0..0..0..1..0..1 ..0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0 ..1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..1 ..0..1..0..1..0..1....0..0..0..1..0..0....0..0..0..1..0..0....0..0..1..0..1..0 ..1..0..1..0..0..0....0..0..1..0..1..0....1..0..1..0..0..1....1..0..0..1..0..1 CROSSREFS Cf. A261265. Sequence in context: A050691 A211720 A261285 * A188243 A335104 A242343 Adjacent sequences: A261254 A261255 A261256 * A261258 A261259 A261260 KEYWORD nonn AUTHOR R. H. Hardin, Aug 13 2015 STATUS approved

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Last modified November 27 01:14 EST 2022. Contains 358362 sequences. (Running on oeis4.)