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Search: id:A071962
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| A071962 |
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Number of double points of the map that, for each term t of a sequence, counts the preceding terms that are greater than or equal to t. |
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+0
1
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| 1, 2, 4, 10, 26, 70, 216, 682, 2264, 7960, 29262, 113256, 452586, 1886306, 8109828, 36274448, 167157176
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Zoran Sunik, Young tableaux and other mutually describing sequences, Journal of Integer Sequences, Vol. 5 (2002), Article 02.1.5
Zoran Sunik, Self-Describing Sequences and the Catalan Family Tree, Electronic Journal of Combinatorics, 10 (2003) #N5.
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EXAMPLE
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The ten double points for n=3 form the following 5 pairs: (0000,0123), (0003,0120), (0020,0103), (0023,0100), (0021,0101)
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CROSSREFS
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Sequence in context: A085455 A055226 A097085 this_sequence A035079 A106221 A125108
Adjacent sequences: A071959 A071960 A071961 this_sequence A071963 A071964 A071965
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KEYWORD
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nonn
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AUTHOR
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Zoran Sunik (zsunik(AT)www.unl.edu), Jun 24 2002
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EXTENSIONS
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More terms from John W. Layman (layman(AT)math.vt.edu), Jul 01 2002
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