34014domain: NAppears in sequencesNumber of n-step four-sided prudent self-avoiding walks ending at the northwest corner of their box.at n=12A191758Triangle read by rows: T(n,k) number of arrangements of non-attacking rooks on an n X n right triangular board where the top rook is in row k (n >= 0, 1 <= k <= n+1).at n=46A259691