103288domain: NAppears in sequencesNumber of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of floor(x(i)/x(i+1)) equal to zero.at n=8A189491a(n) = Sum_{d|n} Sum_{p|n, p prime} d^p.at n=9A351774Number of tilings of a 5 X n rectangle using n pentominoes of shapes T, N, X.at n=48A361250