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Independence number of commuting graph of alternating group A_n.

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`%I #3 Mar 30 2012 16:50:47
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`%S 0,0,0,1,2,3,7,34,190
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`%N Independence number of commuting graph of alternating group A_n.
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`%C The graph is empty for n = 0, 1 and 2, so a(n) = 0 by convention (or should it be 1?).
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`%D A. Iranmanesh and A. Jafarzadeh, On the commuting graph associated with the symmetric and alternating groups, J. Algebra and Applic., 7 (2008), 129-146.
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`%K nonn
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`%O 0,5
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`%A _N. J. A. Sloane_, Mar 07 2008
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