448847

Appears in sequences

• Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused).at n=16A006958
• Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.at n=11A264423