OFFSET
1,5
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
C. Godsil and B. D. McKay, Some computational results on the spectra of graphs, pp. 73-92 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976).
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(10)-a(12) from Sean A. Irvine, May 15 2017
STATUS
approved