OFFSET
0,6
REFERENCES
A. P. Street and R. Day, Sequential binary arrays II: Further results on the square grid, pp. 392-418 of Combinatorial Mathematics IX. Proc. Ninth Australian Conference (Brisbane, August 1981). Ed. E. J. Billington, S. Oates-Williams and A. P. Street. Lecture Notes Math., 952. Springer-Verlag, 1982 (for getting equivalence classes).
LINKS
I. Rivin, I. Vardi and P. Zimmermann, The n-queens problem, Amer. Math. Monthly, 101 (1994), 629-639 (for finding the solutions).
CROSSREFS
KEYWORD
hard,nice,nonn
AUTHOR
Matthias Engelhardt, Apr 05 2000
EXTENSIONS
More terms from Matthias Engelhardt, Jan 11 2001
STATUS
approved