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Search: id:A033584
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| 0, 11, 44, 99, 176, 275, 396, 539, 704, 891, 1100, 1331, 1584, 1859, 2156, 2475, 2816, 3179, 3564, 3971, 4400, 4851, 5324, 5819, 6336, 6875, 7436, 8019, 8624, 9251, 9900, 10571, 11264, 11979, 12716
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of edges of the complete tripartite graph of order 7n, K_n,n,5n - Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Jan 07 2002
Number of edges of the complete tripartite graph of order 6n, K_n,2n,3n - Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Jan 07 2002
11 times the squares. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
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FORMULA
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a(n) = A000290(n)*11. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
a(n)=22*n+a(n-1)-33 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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EXAMPLE
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For n=2, a(2)=22*2+0-33=11; n=3, a(3)=22*3+11-33=44; n=4, a(4)=22*4+44-33=99 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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CROSSREFS
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Cf. A000290. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]
Sequence in context: A022703 A061976 A070930 this_sequence A111080 A022816 A120537
Adjacent sequences: A033581 A033582 A033583 this_sequence A033585 A033586 A033587
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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