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Search: id:A103300
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| A103300 |
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Number of perfect rulers with length n (n>=0). |
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+0
7
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| 1, 1, 1, 2, 3, 4, 2, 12, 8, 4, 38, 30, 14, 6, 130, 80, 32, 12, 500, 326, 150, 66, 18, 4, 944, 460, 166, 56, 12, 6, 2036, 890, 304, 120, 20, 10, 2, 2678, 974, 362, 100, 36, 4, 2, 4892, 2114, 684, 238, 68, 22, 4, 16318, 6350, 2286, 836, 330, 108, 24, 12, 31980, 12252
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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For definitions, references and links related to complete rulers see A103294.
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LINKS
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Index entries for sequences related to perfect rulers.
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FORMULA
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a(n) = T(n, A103298(n)) where the triangle T is described by A103294.
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EXAMPLE
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a(5)=4 counts the perfect rulers with length 5, {[0,1,3,5],[0,2,4,5],[0,1,2,5],[0,3,4,5]}.
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CROSSREFS
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Cf. A004137 (Maximal number of edges in a graceful graph on n nodes).
Cf. A103301, A103297, A103298.
Sequence in context: A047994 A153038 A117009 this_sequence A141470 A141331 A017889
Adjacent sequences: A103297 A103298 A103299 this_sequence A103301 A103302 A103303
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KEYWORD
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nonn,nice
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AUTHOR
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Peter Luschny (peter(AT)luschny.de) Feb 28 2005
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