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A238381
Minimal number of V-trominoes needed to prevent any further V-trominoe from being placed on an n X n grid.
1
0, 1, 2, 3, 4, 6, 8, 11, 14, 18, 21, 25, 30, 35, 40
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
CROSSREFS
Cf. A226918.
Sequence in context: A056829 A211536 A071764 * A290743 A059291 A177339
KEYWORD
nonn,more
AUTHOR
Juris Cernenoks, Feb 25 2014
EXTENSIONS
a(13)-a(15) from Rob Pratt, Oct 02 2019
STATUS
approved