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A139046
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Half the number of symmetric n X n binary matrices with the center of gravity of the 1s at the center.
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1
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1, 2, 12, 52, 1992, 43472, 8084672, 785972800, 632010796352, 260819509251776, 879345967412550400, 1508148706710022883840, 20993821611583601278837888, 147923394778079541856196475392, 8426633557858801012990635249817088
(list; graph; refs; listen; history; internal format)
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