2401422

Appears in sequences

• a(1) = 1, a(n) = Sum_{k=1..n} (k mod 3) * a(n-k) for n >= 2.at n=20A141685
• a(1)=a(2)=a(3)=1, a(4)=3; thereafter a(n) = a(n-1) + a(n-3).at n=39A179070
• 2nd row of the 3-Zeckendorf array (A136189), including prepended terms.at n=40A372760