1149879

Appears in sequences

• Let S(1) = {1} and, for n>1 let S(n) be the smallest set containing x, 2x and x+2 for each element x in S(n-1). a(n) is the number of elements in S(n).at n=28A122554
• Number of chordless cycles in the n-Moebius ladder.at n=28A297667