37068domain: NAppears in sequencesSum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026670.at n=21A026680Number of ways to arrange 2 nonattacking knights on the lower triangle of an n X n board.at n=22A194486Triangle read by rows: T(n,k) = coefficient of x^(n-k) in Product_{m=0..n-1} (x+(-1)^m*m!), 0 <= k <= n.at n=25A260612