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.
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
Links
- Bert Dobbelaere, Illustration for N=20
- Dmitry Kamenetsky, Example solutions for n <= 10
- Puzzling StackExchange, Paint Eight Squares, 2021.
Extensions
a(11)-a(20) from Bert Dobbelaere, Jun 13 2021
a(21)-a(24) from Bert Dobbelaere, Jun 19 2021