OFFSET
3,2
EXAMPLE
a(4) = 3 since when U(4) = {1,3} acts naturally on the three 3-subsets {0,1,2}, {0,1,3}, {0,2,3}, {1,2,3} of Z/(4) the orbits are {{0,1,2},{0,2,3}}, {{0,1,3}} and {{1,2,3}}. Note that 3{0,1,2} = {0,2,3}.
CROSSREFS
KEYWORD
nonn
AUTHOR
W. Edwin Clark, Jul 15 2001
EXTENSIONS
More terms from Sean A. Irvine, Apr 22 2023
STATUS
approved