116985domain: NAppears in sequencesNumber of n X n binary arrays symmetric under 90-degree rotation with all ones connected only in two by two blocks.at n=15A145863Number of magic labelings with magic sum n of first graph shown in link.at n=16A244869Coefficient of x^n in the expansion of 1 / ( (1-x) * (1-x-x^3)^2 )^n.at n=6A372459