OFFSET
0,5
COMMENTS
The graph is empty for n = 0, 1 and 2, so a(n) = 0 by convention (or should it be 1?).
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 07 2008
STATUS
approved