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A047660
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Number of self-complementary 2-plexes.
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2
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1, 1, 0, 1, 2, 40, 0, 703760, 131328, 300241541128192, 0, 28170013344558609991874248704, 24595658799308603392, 9502080486519653717758562294813775233459455787008, 0
(list;
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refs;
listen;
history;
text;
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OFFSET
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1,5
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LINKS
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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