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A146012
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
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0
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1, 1, 1, 1, 1, 3, 10, 21, 36, 85, 291, 923, 3735, 16127, 78677, 397086, 2338305, 14669249, 110594974, 880940226, 8350924404, 83469619311, 977221485292, 12070642055579
(list; graph; refs; listen; history; internal format)
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