520524

Appears in sequences

• a(1) = 1, a(n) = Sum_{k=1..n} (k mod 3) * a(n-k) for n >= 2.at n=18A141685
• a(1)=a(2)=a(3)=1, a(4)=3; thereafter a(n) = a(n-1) + a(n-3).at n=35A179070
• Number of permutations of [n] whose non-fixed points are not neighbors.at n=16A372102
• 2nd row of the 3-Zeckendorf array (A136189), including prepended terms.at n=36A372760