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