OFFSET
1,3
COMMENTS
The V-trominoes must line up with the squares on the grid (skew placements are not allowed).
a(n) is the independent domination number of a graph with one node per tromino and an edge for each pair of trominoes that conflict. - Rob Pratt, Oct 02 2019
LINKS
Juris Cernenoks, Illustration of initial terms
Erich Friedman, Problem of the Month (June 2000)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Juris Cernenoks, Feb 25 2014
EXTENSIONS
a(13)-a(15) from Rob Pratt, Oct 02 2019
STATUS
approved