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A344301
Minimum number of cells in an n X n grid that need to be painted so that each unpainted cell is orthogonally adjacent to exactly one painted cell.
2
1, 2, 3, 4, 8, 12, 15, 16, 24, 28, 35, 36, 48, 54, 63, 64, 77, 88, 96, 100, 117, 130, 140, 144
OFFSET
1,2
LINKS
Bert Dobbelaere, Illustration for N=20
Puzzling StackExchange, Paint Eight Squares, 2021.
CROSSREFS
Sequence in context: A361108 A283659 A355441 * A032939 A366201 A030073
KEYWORD
nonn,hard,more
AUTHOR
Dmitry Kamenetsky, May 14 2021
EXTENSIONS
a(11)-a(20) from Bert Dobbelaere, Jun 13 2021
a(21)-a(24) from Bert Dobbelaere, Jun 19 2021
STATUS
approved