|
Search: id:A051759
|
|
|
| A051759 |
|
Consider the problem of placing A051756(n) queens on an n X n board so that each queen attacks precisely 3 others. Sequence gives number of solutions up to square symmetry. |
|
+0
13
|
| |
|
|
OFFSET
|
2,2
|
|
|
REFERENCES
|
M. Gardner, The Last Recreations, Springer, 1997, p. 282.
M. Gardner, The Colossal Book of Mathematics, 2001, p. 209.
|
|
LINKS
|
Erich Friedman, Illustration of initial terms
|
|
CROSSREFS
|
Cf. A051754-A051758, A051567-A051571, A019654.
Sequence in context: A018294 A051569 A087186 this_sequence A051570 A082913 A083205
Adjacent sequences: A051756 A051757 A051758 this_sequence A051760 A051761 A051762
|
|
KEYWORD
|
nonn,nice,more
|
|
AUTHOR
|
Robert Trent (trentrd(AT)hotmail.com), Aug 23 2000
|
|
|
Search completed in 0.002 seconds
|
