A006612 - OEIS

%I M1654 #13 May 15 2017 18:19:33

%S 0,0,0,0,2,6,21,75,411,2114,13529,108243

%N Number of n-node bipartite graphs not determined by their spectra.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H C. Godsil and B. D. McKay, <a href="http://doi.org/10.1007/BFb0097370">Some computational results on the spectra of graphs</a>, pp. 73-92 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976).

%K nonn

%O 1,5

%A _N. J. A. Sloane_.

%E a(10)-a(12) from _Sean A. Irvine_, May 15 2017