205221

Appears in sequences

• a(1) = a(2) = 1, a(3) = 4; thereafter a(n) = a(n-1) + a(n-3).at n=31A001609
• Expansion of 1/(1-2*x-3*x^2+2*x^3).at n=12A046672
• Number of independent vertex sets and vertex covers in the n-antiprism graph.at n=16A286910
• a(n) = round(c^n), where c is the supergolden ratio A092526.at n=32A382641