20069280

Appears in sequences

• a(n) = Sum_{k=0..floor(n/4)} C(n-k,3*k) * 2^(n-3*k).at n=17A099785
• Triangular numbers that are one-eighth of other triangular numbers; T(t) such that 8*T(t)=T(u) for some u where T(k) is the k-th triangular number.at n=5A336624