96861domain: NAppears in sequencesa(n) = n^5 + 4*n^4 + 13*n^3 + 23*n^2 + 25*n + 3.at n=9A270869Number of nonempty subsets of {1..n} with mean n/2.at n=23A362046Numbers k such that k + sopfr(k) is a cube.at n=42A389862