3530641domain: NAppears in sequencesNumber of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=7A207756Smallest square that can be expressed as Sum_{i=1..n} p(2i-1)^p(2i) where p is a permutation of {1, 2, 3, ..., 2n}.at n=6A372652