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 A147040 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation. 0
 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 9, 9, 21, 21, 69, 69, 305, 305, 1333, 1333, 6087, 6087, 37147, 37147, 280959, 280959 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 LINKS Table of n, a(n) for n=1..28. EXAMPLE Maximal 9 X 9 example .0.0.1.0.0.0.1.0.0 .0.0.1.0.0.0.1.0.0 .1.1.1.1.0.1.1.1.1 .0.0.1.0.0.0.1.0.0 .0.0.0.0.0.0.0.0.0 .0.0.1.0.0.0.1.0.0 .1.1.1.1.0.1.1.1.1 .0.0.1.0.0.0.1.0.0 .0.0.1.0.0.0.1.0.0 CROSSREFS Sequence in context: A147472 A146914 A146253 * A146277 A050822 A187494 Adjacent sequences: A147037 A147038 A147039 * A147041 A147042 A147043 KEYWORD nonn AUTHOR R. H. Hardin, Nov 04 2008 STATUS approved

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Last modified May 27 03:56 EDT 2024. Contains 372847 sequences. (Running on oeis4.)