While we have searched for variations of bridged annulenes in this work, we consider it likely that the class of molecules can be expanded into further subclasses. In particular, larger annulenic perimeters may exist, and some have already been suggested as inverted gap systems. However, more bondlength alternation is to be expected in larger annulenic frames as the aromaticity in the perimeter weakens with increasing size, which may limit the potential for singlet-triplet inversion. Considering the number of possible structural combinations there can be for [18]annulene perimeters, and how the increased molecular size will limit the possibility of using EOM-CCSD, we leave this exploration for future efforts.