OFFSET
0,4
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Russell Merris and William Watkins, Tensors and graphs, SIAM J. Algebraic Discrete Methods 4 (1983), no. 4, 534-547.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(7)-a(17) from Andrey Zabolotskiy, Sep 10 2018
a(18)-a(22) from Sean A. Irvine, Mar 02 2022
STATUS
approved