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 A352661 Number of doubly symmetric characteristic solutions to the n-superqueens problem. 4
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 12, 17, 0, 0, 60, 82 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,12 COMMENTS Superqueens are also called amazons. They combine the moves of queen and knight. REFERENCES Martin Gardner, Fractal Music, Hypercards, and More, W H Freeman, 1991, page 238 (based on his column in Scientific American, June 1979). 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 For n=12 the a(12)=2 solutions are +-------------------------+ +-------------------------+ | . . . . A . . . . . . . | | . . . . A . . . . . . . | | . . . . . . . . . A . . | | . . . . . . . . . A . . | | . A . . . . . . . . . . | | . A . . . . . . . . . . | | . . . . . A . . . . . . | | . . . . . . A . . . . . | | . . . . . . . . . . . A | | . . . . . . . . . . . A | | . . . . . . . . A . . . | | . . . A . . . . . . . . | | . . . A . . . . . . . . | | . . . . . . . . A . . . | | A . . . . . . . . . . . | | A . . . . . . . . . . . | | . . . . . . A . . . . . | | . . . . . A . . . . . . | | . . . . . . . . . . A . | | . . . . . . . . . . A . | | . . A . . . . . . . . . | | . . A . . . . . . . . . | | . . . . . . . A . . . . | | . . . . . . . A . . . . | +-------------------------+ +-------------------------+ CROSSREFS A051224 = A352661 + A352662 + A352663. A051223 = 2*A352661 + 4*A352662 + 8*A352663 (when n>1). Sequence in context: A337999 A037224 A122670 * A283494 A353254 A281034 Adjacent sequences: A352658 A352659 A352660 * A352662 A352663 A352664 KEYWORD nonn,more AUTHOR Don Knuth, Mar 25 2022 STATUS approved

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Last modified August 12 15:11 EDT 2024. Contains 375113 sequences. (Running on oeis4.)