131876domain: NAppears in sequencesRow 4 of array in A047666.at n=24A047668Triangle T(n,k) (n >= 2, k = 3..n+floor(n/2)) giving number of bicoverings of an n-set with k blocks.at n=23A059443Number of 7-block bicoverings of an n-set.at n=6A059948Number of n-block bicoverings of an n-set.at n=7A275517