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 A261284 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101. 1
 36, 77, 271, 1147, 6996, 51268, 561724, 6295926, 107865659, 2065840014, 57883274521, 1752577624054, 80161163488540, 3993898268151118, 295206710031036849, 23800415351857927140, 2870471520849798820514 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A261292. LINKS R. H. Hardin, Table of n, a(n) for n = 1..22 EXAMPLE Some solutions for n=4 ..1..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..0..1..0..1....0..1..0..1..0..1....0..0..0..0..0..1....0..1..0..1..0..1 ..1..0..1..0..1..0....1..0..0..0..1..0....0..0..1..0..1..0....1..0..1..0..1..0 ..0..1..0..1..0..1....0..1..0..1..0..0....0..0..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..0..0..0....0..1..0..1..0..1....0..1..0..0..0..1 CROSSREFS Cf. A261292. Sequence in context: A262796 A255101 A255094 * A111163 A286430 A279901 Adjacent sequences: A261281 A261282 A261283 * A261285 A261286 A261287 KEYWORD nonn AUTHOR R. H. Hardin, Aug 14 2015 STATUS approved

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Last modified March 3 15:08 EST 2024. Contains 370512 sequences. (Running on oeis4.)