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A064761 15n^2. +0
2
0, 15, 60, 135, 240, 375, 540, 735, 960, 1215, 1500, 1815, 2160, 2535, 2940, 3375, 3840, 4335, 4860, 5415, 6000, 6615, 7260, 7935, 8640, 9375, 10140, 10935, 11760, 12615, 13500, 14415, 15360, 16335, 17340, 18375, 19440, 20535, 21660, 22815 (list; graph; listen)
OFFSET

0,2

COMMENT

Number of edges in a complete 6-partite graph of order 6n, K_n,n,n,n,n,n

15 times the squares. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]

FORMULA

a(n) = A000290(n)*15 = A033428(n)*5 = A033429(n)*3. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]

MAPLE

seq(bell(4, j)*(j-2)^2, j = 2 .. 41) ; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 29 2007

CROSSREFS

A033583, A033581, A033428, A000290, A000217.

Cf. A033429. [From Omar E. Pol (info(AT)polprimos.com), Dec 13 2008]

Sequence in context: A012691 A020187 A022287 this_sequence A005945 A110755 A001756

Adjacent sequences: A064758 A064759 A064760 this_sequence A064762 A064763 A064764

KEYWORD

nonn

AUTHOR

Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Oct 18 2001

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


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