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A361452
Number of colorings of an n X n grid up to permutation of the colors with no element having the same color as any diagonal or antidiagonal neighbor.
1
1, 7, 4192, 953124784, 213291369981652792, 96638817185266245591837984336, 160065721141038888919235753368205172658011648, 1603869086916486859475402575499346988054543498175515730927380336, 150972529586126094166343144224892296826763766718771806614594599643773846828229334720096
OFFSET
1,2
CROSSREFS
Main diagonal of A207981.
Sequence in context: A069644 A203679 A145696 * A338250 A103856 A364640
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 13 2023
STATUS
approved