OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Irredundant Set
Eric Weisstein's World of Mathematics, Knight Graph
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Aug 10 2017
EXTENSIONS
a(5)-a(6) from Andrew Howroyd, Aug 19 2017
STATUS
approved