331170domain: NAppears in sequencesNumber of nX7 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=9A224037Squarefree numbers n such that psi(phi(n)) = phi(psi(n) - n).at n=7A292048Expansion of (1 - x)^(-2) * Sum_{j>=0} (x^j / (1 - Sum_{k=1..j} x^k)).at n=20A369115