OFFSET
0,4
COMMENTS
Denominators are A208648. The fractions begin: 1/2, 1/2, 7/4, 2/1, 2/1, 17/6, 3/1, 3/1, 31/8, 4/1, 4/1, 49/10, 5/1, 5/1, 71/12.
LINKS
Alexey Pokrovskiy, Edge growth in graph powers, arXiv:1202.6085v1 [math.CO], Feb 27, 2012.
FORMULA
If n == 0 (mod 3) then e(G^n)/e(G) = ((n+3)/3) - 3/(2*(n+3));
If n =/= 0 (mod 3) then e(G^n)/e(G) = ceiling(n/3).
CROSSREFS
KEYWORD
nonn,easy,frac
AUTHOR
Jonathan Vos Post, Feb 29 2012
STATUS
approved