Number of non-symmetric binary n X n matrices M over the reals such that M^2 is the transpose of M.

A336174

Number of non-symmetric binary n X n matrices M over the reals such that M^2 is the transpose of M.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =16a(5) =80a(6) =360a(7) =1680a(8) =8064a(9) =39872a(10) =209920a(11) =1168640a(12) =6779520a(13) =41403648a(14) =265434624a(15) =1765487360a(16) =12227461120a(17) =88163164160a(18) =656547803136

External references