Number of n-node graphs not determined by their spectrum.

A006608

Number of n-node graphs not determined by their spectrum.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =10a(6) =110a(7) =1722a(8) =51039a(9) =2560606a(10) =215331676a(11) =31067572481

External references