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A337503 Minimum number of painted cells in an n X n grid to avoid unpainted pentominoes. 1
0, 0, 3, 5, 8, 13, 17, 24, 31, 39 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

Puzzling Stack Exchange, Least number of marked symbols

EXAMPLE

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 . .

CROSSREFS

Cf. A337501, A337502.

Sequence in context: A097431 A123929 A036715 * A310035 A310036 A265046

Adjacent sequences:  A337500 A337501 A337502 * A337504 A337505 A337506

KEYWORD

nonn,more

AUTHOR

Rob Pratt, Aug 29 2020

STATUS

approved

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Last modified March 8 11:25 EST 2021. Contains 341948 sequences. (Running on oeis4.)