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Search: id:A005219
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| A005219 |
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Number of unlabeled identity unit interval graphs.
(Formerly M1289)
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+0
2
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| 0, 0, 0, 0, 0, 2, 4, 15, 36, 108, 276, 771, 2044, 5622, 15204, 41835, 114708, 317382, 879008, 2447951, 6833084, 19146910, 53786076, 151537847, 427946916, 1211440440, 3436543336, 9768382171, 27817787344, 79356481542
(list; graph; listen)
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OFFSET
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1,6
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REFERENCES
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Hanlon, Phil; Counting interval graphs. Trans. Amer. Math. Soc. 272 (1982), no. 2, 383-426.
R. W. Robinson, personal communication.
R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1980.
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LINKS
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R. W. Robinson, Table of n, a(n) for n = 1..190
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CROSSREFS
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Cf. A007122.
Adjacent sequences: A005216 A005217 A005218 this_sequence A005220 A005221 A005222
Sequence in context: A080623 A073814 A007122 this_sequence A055466 A072206 A109642
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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