A337503 Minimum number of painted cells in an n X n grid to avoid unpainted pentominoes.

0, 0, 3, 5, 8, 13, 17, 24, 31, 39

Offset: 1

Author

Rob Pratt, Aug 29 2020

Keywords

• nonn
• more

Examples

			For n = 3, painting only 2 cells would leave an unpainted pentomino, but painting the following 3 cells avoids all unpainted pentominoes:
. . .
. X X
X . .
		

Links

• Puzzling Stack Exchange, Least number of marked symbols

Crossrefs

Cf. A337501, A337502.