967540

Appears in sequences

• a(n) = a(n-1) + a(n-2) + 2 a([(n-1)/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=27A298354
• Numbers k such that sigma(k) = psi(k) + tau(k)^4.at n=27A389546