-16257

Appears in sequences

• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^7.at n=3A321563
• Square array A(n,k), n >= 1, k >= 0, read by antidiagonals: A(n,k) = Sum_{d|n} (-1)^(n/d+d)*d^k.at n=58A322083