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A033584 11n^2. +0
1
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)
OFFSET

0,2

COMMENT

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]

FORMULA

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]

EXAMPLE

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]

CROSSREFS

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

KEYWORD

nonn,new

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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