A352663 Number of asymmetric characteristic solutions to the n-superqueens problem.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 18, 231, 642, 4040, 25320, 166201, 1115373, 8060958, 61981118, 497224414

Offset: 1

Author

Don Knuth, Mar 25 2022

Keywords

• nonn
• more

Examples

			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.
		

References

• D. E. Knuth, The Art of Computer Programming, Section 7.2.2.3 (draft, March 2022).

Crossrefs

Cf. A051223, A051224, A352661, A352662.