456536705625domain: NAppears in sequencesMaximum number of binary strings with symmetrically partitioned n 1's and n 0's, counted up to isomorphism.at n=26A250029a(n) = cpg(n, 3) * cpg(n, 4) * ... * cpg(n, n) where cpg(n, m) is the m-th n-th-order centered polygonal number.at n=8A257132