67108813

Appears in sequences

• Moebius transform of A000048 (starting at term 0).at n=32A054174
• a(n) = 4*A061547(n+1) - 3*A166753(n).at n=24A166754
• The number of order-preserving partial isometries (of an n-chain) of fix zero (fix of alpha = 0). Equivalently, the number of order-preserving partial derangement isometries (of an n-chain).at n=25A183155