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Number of colorings of an n X n grid with at most n interchangeable colors under rotational and reflectional symmetry.
4

%I #7 Oct 06 2022 14:42:05

%S 1,4,490,22396971,310449924192274,1790711048631786194374209,

%T 6372121790133410693083324907292917240,

%U 19460266334869242507206895620675207301301857505549306

%N Number of colorings of an n X n grid with at most n interchangeable colors under rotational and reflectional symmetry.

%D F. Harary and E. Palmer, Graphical Enumeration, Academic Press, 1973.

%H Marko Riedel, <a href="/A357536/a357536.maple.txt">Maple code, Power Group Enumeration</a>

%Y Cf. A182044, A264741, A264742.

%K nonn

%O 1,2

%A _Marko Riedel_, Oct 02 2022