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A352663
Number of asymmetric characteristic solutions to the n-superqueens problem.
3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 18, 231, 642, 4040, 25320, 166201, 1115373, 8060958, 61981118, 497224414
OFFSET
1,11
REFERENCES
D. E. Knuth, The Art of Computer Programming, Section 7.2.2.3 (draft, March 2022).
EXAMPLE
One of the a(11)=5 solutions is
+-----------------------+
| A . . . . . . . . . . |
| . . . . A . . . . . . |
| . . . . . . . . A . . |
| . A . . . . . . . . . |
| . . . . . A . . . . . |
| . . . . . . . . . A . |
| . . A . . . . . . . . |
| . . . . . . A . . . . |
| . . . . . . . . . . A |
| . . . A . . . . . . . |
| . . . . . . . A . . . |
+-----------------------+
and the other four are obtained by wraparound shifts.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Don Knuth, Mar 25 2022
STATUS
approved