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 A194495 Number of ways to arrange 5 nonattacking queens on the lower triangle of an n X n board 1

%I

%S 0,0,0,0,0,0,4,114,1384,9890,50662,205512,698688,2074530,5525902,

%T 13476246,30522678,64968996,131070600,252492296,467017054,833501728,

%U 1440839952,2420878990,3964168632,6342428908,9934738024,15264432954

%N Number of ways to arrange 5 nonattacking queens on the lower triangle of an n X n board

%C Column 5 of A194498

%H R. H. Hardin, <a href="/A194495/b194495.txt">Table of n, a(n) for n = 1..49</a>

%e All solutions for 7X7

%e ..0..............0..............0..............0

%e ..0.0............0.0............0.0............0.0

%e ..1.0.0..........0.1.0..........1.0.0..........0.0.1

%e ..0.0.0.1........0.0.0.1........0.0.1.0........1.0.0.0

%e ..0.1.0.0.0......1.0.0.0.0......0.0.0.0.1......0.0.0.1.0

%e ..0.0.0.0.1.0....0.0.1.0.0.0....0.1.0.0.0.0....0.1.0.0.0.0

%e ..0.0.1.0.0.0.0..0.0.0.0.1.0.0..0.0.0.1.0.0.0..0.0.0.0.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_ Aug 26 2011

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Last modified May 18 16:24 EDT 2022. Contains 353816 sequences. (Running on oeis4.)