A337501 Minimum number of painted cells in an n X n grid to avoid unpainted trominoes.

0, 2, 4, 8, 11, 18, 23, 32, 39, 50

Offset

1,2

Links

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

Example

For n = 3, painting only 3 cells would leave an unpainted tromino, but painting the following 4 cells avoids all unpainted trominoes:
. . X
X X .
. . X

Crossrefs

Sequence in context: A120632 A007295 A053439 * A365922 A180379 A033956

Adjacent sequences: A337498 A337499 A337500 * A337502 A337503 A337504

Keyword

nonn,more

Author

Rob Pratt, Aug 29 2020

Status

approved