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A324693
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Number of simple graphs on n unlabeled nodes with minimum degree exactly 1.
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4
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0, 1, 1, 4, 12, 60, 378, 3843, 64455, 1921532, 104098702, 10348794144, 1893781768084, 639954768875644, 400905675004630820, 467554784370658979194, 1019317687720204607541914, 4170177760438554428852944352, 32130458453030025927403299167172
(list;
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listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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FORMULA
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CROSSREFS
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The generalization to set-systems is A327335, with covering case A327230.
Unlabeled covering graphs are A002494.
Cf. A000088, A004110, A100743, A141580, A245797, A261919, A327105, A327362, A327364, A327366, A327372.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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