91169

Appears in sequences

• Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 1,0 0,-1 1,2 or -1,1.at n=41A264584
• Number of refinement sequences n -> ... -> {1}^n, where in each step every single part of a nonempty selection of parts is replaced by a partition of itself into two smaller parts (in weakly decreasing order).at n=9A327699