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%I #26 Jun 19 2021 03:54:24
%S 1,2,3,4,8,12,15,16,24,28,35,36,48,54,63,64,77,88,96,100,117,130,140,
%T 144
%N 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.
%H Bert Dobbelaere, <a href="/A344301/a344301.png">Illustration for N=20</a>
%H Dmitry Kamenetsky, <a href="/A344301/a344301.txt">Example solutions for n <= 10</a>
%H Puzzling StackExchange, <a href="https://puzzling.stackexchange.com/questions/110235/paint-eight-squares">Paint Eight Squares</a>, 2021.
%K nonn,hard,more
%O 1,2
%A _Dmitry Kamenetsky_, May 14 2021
%E a(11)-a(20) from _Bert Dobbelaere_, Jun 13 2021
%E a(21)-a(24) from _Bert Dobbelaere_, Jun 19 2021
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