146804domain: NAppears in sequencesNumbers n such that if x=sigma(n)-tau(n)-n then n=sigma(x)-tau(x)-x.at n=39A238227Number of (n+1) X (1+1) arrays of permutations of 0..n*2+1 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.at n=15A264484