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A101388
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Number of n-vertex unlabeled digraphs without endpoints.
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0
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..6.
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CROSSREFS
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Cf. A100548 (labeled case), A004110, A004108, A059166, A059167.
Sequence in context: A134053 A136472 A145404 * A050789 A187236 A091060
Adjacent sequences: A101385 A101386 A101387 * A101389 A101390 A101391
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KEYWORD
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more,nonn
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AUTHOR
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Goran Kilibarda, Zoran Maksimovic, Vladeta Jovovic, Jan 14 2005
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STATUS
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approved
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