271468

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=25A122554
• a(n) = n + 2*cos((n*Pi)/3) + Lucas(n).at n=25A297661
• Number of chordless cycles in the n-web graph.at n=23A297665
• Expansion of e.g.f. exp(x) / (4 - 3*exp(3*x)).at n=4A368441