1073741765domain: NAppears in sequencesa(n) = 4*A061547(n+1) - 3*A166753(n).at n=28A166754The 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=29A183155