122901domain: NAppears in sequencesNumber of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.at n=10A146013Number of self-inverse permutations in S_n with longest increasing subsequence of length 6.at n=7A217326