login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A194496 Number of ways to arrange 6 nonattacking queens on the lower triangle of an n X n board. 1
0, 0, 0, 0, 0, 0, 0, 0, 64, 1644, 19306, 146718, 820218, 3670288, 13846830, 45661556, 134896662, 364019248, 909633276, 2129318414, 4709083054, 9912162234, 19970298696, 38707229282, 72458290216, 131476840106, 231906957348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

Column 6 of A194498.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..35

EXAMPLE

Some solutions for 9 X 9:

  0                  0                  0                  0

  0 1                0 0                1 0                0 0

  0 0 0              1 0 0              0 0 0              0 1 0

  1 0 0 0            0 0 0 0            0 0 0 0            0 0 0 0

  0 0 0 0 0          0 0 0 0 1          0 0 0 0 1          1 0 0 0 0

  0 0 0 1 0 0        0 0 1 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 0 1 0      0 0 0 1 0 0 0      0 0 0 0 1 0 0

  0 0 1 0 0 0 0 0    0 0 0 1 0 0 0 0    0 0 0 0 0 1 0 0    0 0 0 0 0 0 0 1

  0 0 0 0 1 0 0 0 0  0 1 0 0 0 0 0 0 0  0 0 1 0 0 0 0 0 0  0 0 0 1 0 0 0 0 0

CROSSREFS

Sequence in context: A162994 A225981 A232427 * A297092 A284340 A195807

Adjacent sequences:  A194493 A194494 A194495 * A194497 A194498 A194499

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 26 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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