4367946

Appears in sequences

• a(1) = a(2) = 1, a(3) = 4; thereafter a(n) = a(n-1) + a(n-3).at n=39A001609
• Number of independent vertex sets and vertex covers in the n-antiprism graph.at n=20A286910
• a(n) = round(c^n), where c is the supergolden ratio A092526.at n=40A382641