108756domain: NAppears in sequencesNumber of ways 1/n can be expressed as the sum of four distinct unit fractions: 1/n = 1/w + 1/x + 1/y + 1/z satisfying 0 < w < x < y < z.at n=44A241883Number of tilings of a 15 X n rectangle using 3n pentominoes of shape I.at n=14A247218