79924domain: NAppears in sequencesa(n) = 144*n^2 - 127*n + 28.at n=23A156719Number of permutations p on the set [n] with the properties that abs(p(i)-i) <= 3 for all i, p(1) <= 2, and p(j) >= 2 for j=3,4.at n=12A188498