A243720 - OEIS

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A243720

Number of inequivalent (mod D_8) ways to place 5 nonattacking knights on an n X n board.

%I #8 Jun 19 2014 11:50:40

%S 2,49,1244,12329,81900,398907,1562362,5153001,14907120,38753358,

%T 92417760,204977323,427812496,847346181,1604300270

%N Number of inequivalent (mod D_8) ways to place 5 nonattacking knights on an n X n board.

%F a(n) = (n^10 - 90*n^8 + 240*n^7 + 3235*n^6)/960 + O(n^5) for n >= 8.

%Y Cf. A243716, A172136, A243717, A243718, A243719.

%K nonn,more

%O 3,1

%A _Heinrich Ludwig_, Jun 19 2014