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 A146068 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0
 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 19, 19, 69, 69, 389, 389, 2287, 2287, 15081, 15081, 141721, 141721, 1694175, 1694175, 23795099, 23795099 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,11 LINKS EXAMPLE Maximal 11 X 11 example .0.0.1.0.0.0.0.0.1.0.0 .0.0.1.1.1.0.1.1.1.0.0 .1.1.0.0.1.0.1.0.0.1.1 .0.1.0.0.0.0.0.0.0.1.0 .0.1.1.0.0.0.0.0.1.1.0 .0.0.0.0.0.0.0.0.0.0.0 .0.1.1.0.0.0.0.0.1.1.0 .0.1.0.0.0.0.0.0.0.1.0 .1.1.0.0.1.0.1.0.0.1.1 .0.0.1.1.1.0.1.1.1.0.0 .0.0.1.0.0.0.0.0.1.0.0 CROSSREFS Sequence in context: A146903 A146607 A147072 * A146911 A146250 A232023 Adjacent sequences: A146065 A146066 A146067 * A146069 A146070 A146071 KEYWORD nonn AUTHOR R. H. Hardin, Oct 26 2008 STATUS approved

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Last modified December 5 02:30 EST 2022. Contains 358572 sequences. (Running on oeis4.)