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A194495 Number of ways to arrange 5 nonattacking queens on the lower triangle of an n X n board 1
0, 0, 0, 0, 0, 0, 4, 114, 1384, 9890, 50662, 205512, 698688, 2074530, 5525902, 13476246, 30522678, 64968996, 131070600, 252492296, 467017054, 833501728, 1440839952, 2420878990, 3964168632, 6342428908, 9934738024, 15264432954 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

Column 5 of A194498

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..49

EXAMPLE

All solutions for 7X7

..0..............0..............0..............0

..0.0............0.0............0.0............0.0

..1.0.0..........0.1.0..........1.0.0..........0.0.1

..0.0.0.1........0.0.0.1........0.0.1.0........1.0.0.0

..0.1.0.0.0......1.0.0.0.0......0.0.0.0.1......0.0.0.1.0

..0.0.0.0.1.0....0.0.1.0.0.0....0.1.0.0.0.0....0.1.0.0.0.0

..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

CROSSREFS

Sequence in context: A299222 A300036 A199834 * A260575 A275747 A239942

Adjacent sequences:  A194492 A194493 A194494 * A194496 A194497 A194498

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 26 2011

STATUS

approved

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Last modified January 21 09:14 EST 2022. Contains 350475 sequences. (Running on oeis4.)