455534domain: NAppears in sequencesLength of list created by n substitutions k -> Range( -abs(k+1), abs(k-1), 2) starting with {1}.at n=13A084075Array read by downward antidiagonals: A(n,k) = A(n-1,k+1) + (k+1)*Sum_{j=0..k} A(n-1,j) with A(0,k) = k+1, n >= 0, k >= 0.at n=42A371567