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A264742 Number of colorings of an n X n grid with at most four interchangeable colors under rotational and reflectional symmetry. 3
1, 1, 7, 1555, 22396971, 5864091026091, 24595658827938966187, 1650586719048786316922366635, 1772303994379887884341412962742479531, 30447950777727144129269702965544605972525918891, 8369468980515574351781052578115407607294645079941040482987 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
REFERENCES
F. Harary and E. Palmer, Graphical Enumeration, Academic Press, 1973.
LINKS
Math StackExchange, A 4 x 4 grid of squares.
CROSSREFS
Sequence in context: A265963 A191957 A125537 * A308441 A220989 A284705
KEYWORD
nonn
AUTHOR
Marko Riedel, Nov 22 2015
STATUS
approved

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Last modified May 22 04:07 EDT 2024. Contains 372742 sequences. (Running on oeis4.)