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A147078
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11111-10000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 9, 21, 61, 210, 735, 3592, 21789, 146171, 1140039, 10204453, 104577719, 1275721875, 18485616051, 314997048326, 6290384717771, 146342301648076
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