939136domain: NAppears in sequencesNumber of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j <= k or i <= j > k.at n=12A328491a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 7*y^2 = k.at n=24A374159