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A264742
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Number of colorings of an n X n grid with at most four interchangeable colors under rotational and reflectional symmetry.
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3
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1, 1, 7, 1555, 22396971, 5864091026091, 24595658827938966187, 1650586719048786316922366635, 1772303994379887884341412962742479531, 30447950777727144129269702965544605972525918891, 8369468980515574351781052578115407607294645079941040482987
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OFFSET
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0,3
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REFERENCES
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F. Harary and E. Palmer, Graphical Enumeration, Academic Press, 1973.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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