2406208domain: NAppears in sequencesNumber of tri-coverings of a set.at n=6A165434Number of (6*n) X 6 binary arrays with rows in nonincreasing order and n ones in every column.at n=2A188390T(n,k) = number of (n*k) X k binary arrays with rows in nonincreasing order and n ones in every column.at n=30A188392