170334

Appears in sequences

• Number of compositions (ordered partitions) of n into powers of 4.at n=39A087221
• G.f. satisfies A(x) = 1 + x*A(x)*f(x)^3, where f(x) = Sum_{k>=0} x^((4^k-1)/3).at n=13A087222
• a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).at n=11A324915