1519616domain: NAppears in sequencesNumber of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 1,0 1,1 0,-1 or -1,1.at n=16A264570Number of subsets of {1..n} that cannot be linearly combined using nonnegative coefficients to obtain n.at n=33A365380