OFFSET
2,2
REFERENCES
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
J.-C. Bermond, Ordres à distance minimum d'un tournoi et graphes partiels sans circuits maximaux, Math. Sci. Hum., No. 37 (1972), 5-25.
J.-C. Bermond, Ordres à distance minimum d'un tournoi et graphes partiels sans circuits maximaux, Math. Sci. Hum., No. 37 (1972), 5-25. [Annotated scanned copy]
K. B. Reid, On sets of arcs containing no cycles in tournaments, Canad. Math. Bull., 12 (1969), 261-264.
N. J. A. Sloane and K. B. Reid, Correspondence concerning this sequence
FORMULA
a(n) = binomial(n,2) - A003141(n).
CROSSREFS
KEYWORD
nonn,nice,hard,more
AUTHOR
STATUS
approved