A045657 2n-bead balanced binary strings, rotationally inequivalent to reverse, complement and reversed complement.

0, 0, 0, 0, 0, 80, 384, 2352, 9856, 42840, 169360, 676720, 2631072, 10265216, 39779600, 154498280, 599565952, 2330826752, 9068429544, 35332969392, 137817174800, 538204065336, 2103971573264, 8233197139552, 32247054724768