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A146417
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 51, 123, 453, 1219, 4641, 13599, 63683, 242234, 1440301, 6546459, 44699492, 239296946, 1977082524, 12922743339, 130202512826, 1020385455911, 12242346882334
(list; graph; refs; listen; history; internal format)
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