646015

Appears in sequences

• a(1) = a(2) = 1, a(3) = 4; thereafter a(n) = a(n-1) + a(n-3).at n=34A001609
• a(n) = round(c^n), where c is the supergolden ratio A092526.at n=35A382641
• a(n) = a(n-1)+2*a(n-2)+a(n-3) with a(0)=1, a(1)=4, a(2) = 6.at n=17A384367