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

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

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