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A135908
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Clique number of commuting graph of symmetric group S_n.
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0
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0, 0, 0, 2, 3, 5, 8, 11, 17, 26, 35, 53, 80, 107, 161, 242, 323, 485, 728, 971, 1457, 2186, 2915, 4373, 6560, 8747, 13121, 19682, 26243, 39365, 59048, 78731, 118097, 177146, 236195, 354293, 531440, 708587, 1062881, 1594322, 2125763, 3188645, 4782968, 6377291, 9565937
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| 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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REFERENCES
| 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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MATHEMATICA
| f[n_]:=n+Divisors[n+1][[Length[Divisors[n+1]]-1]]; a=1; Table[a=f[a], {n, 5!}] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 03 2010]
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CROSSREFS
| Sequence in context: A131787 A091498 A000511 * A056891 A065462 A062762
Adjacent sequences: A135905 A135906 A135907 * A135909 A135910 A135911
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 07 2008
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