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 A146132 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation. 0
 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 59, 59, 325, 325, 2193, 2193, 20593, 20593, 247017, 247017, 3816169, 3816169, 76385445 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,11 LINKS EXAMPLE Maximal 11 X 11 example .0.0.0.1.0.0.0.1.0.0.0 .0.0.0.1.0.0.0.1.0.0.0 .0.0.0.1.1.0.1.1.0.0.0 .1.1.1.0.1.0.1.0.1.1.1 .0.0.1.1.0.0.0.1.1.0.0 .0.0.0.0.0.0.0.0.0.0.0 .0.0.1.1.0.0.0.1.1.0.0 .1.1.1.0.1.0.1.0.1.1.1 .0.0.0.1.1.0.1.1.0.0.0 .0.0.0.1.0.0.0.1.0.0.0 .0.0.0.1.0.0.0.1.0.0.0 CROSSREFS Sequence in context: A147045 A146065 A146242 * A282982 A282952 A095342 Adjacent sequences:  A146129 A146130 A146131 * A146133 A146134 A146135 KEYWORD nonn AUTHOR R. H. Hardin, Oct 27 2008 STATUS approved

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Last modified November 28 04:13 EST 2021. Contains 349400 sequences. (Running on oeis4.)