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

1,11

References

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

Links

Table of n, a(n) for n=1..21.

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

Cf. A051223, A051224, A352661, A352662.

Sequence in context: A281564 A291356 A091059 * A203180 A359616 A359560

Adjacent sequences: A352660 A352661 A352662 * A352664 A352665 A352666

Keyword

nonn,more

Author

Don Knuth, Mar 25 2022

Status

approved