OFFSET
1,2
COMMENTS
Cover may include multiple occurrences of a subset. Also n-rowed binary matrices with distinct rows and all row sums 3.
REFERENCES
For labeled case see Goulden I. P., Jackson D. M., Combinatorial Enumeration, John Wiley and Sons, New York, 1983.
LINKS
Vladeta Jovovic, Formula
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Nov 30 2000
EXTENSIONS
More terms from T. Forbes (anthony.d.forbes(AT)googlemail.com), May 24, 2003
STATUS
approved