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A243720
Number of inequivalent (mod D_8) ways to place 5 nonattacking knights on an n X n board.
4
2, 49, 1244, 12329, 81900, 398907, 1562362, 5153001, 14907120, 38753358, 92417760, 204977323, 427812496, 847346181, 1604300270
OFFSET
3,1
FORMULA
a(n) = (n^10 - 90*n^8 + 240*n^7 + 3235*n^6)/960 + O(n^5) for n >= 8.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Heinrich Ludwig, Jun 19 2014
STATUS
approved