A140393 - OEIS

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A140393

Erroneous duplicate of A000170, see comments.

1, 0, 0, 2, 10, 4, 40, 92, 352, 724, 2680, 14200, 73712, 365596, 2279184, 14772512, 95815104, 666090624, 4968057848, 39029188884, 314666222712, 2691008701644, 24233937684440, 226732487925864

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

COMMENTS

This is a new calculation of A000170 which produced a different answer for n=24. I do not know which version is correct and I have therefore created this second entry for the values found by the NQueens(AT)home team. See the main entry for this sequence, A000170, for many further references and comments.

As discovered on Nov 07 2008, this sequence is likely to suffer from an overflow error in the implementation of the NQueens(AT)Home project. The results differ by 781684047872 = 0xb600000000 = 182 * 2^32.

LINKS

Table of n, a(n) for n=1..24.

NQueens(AT)home, Home Page [Via Internet Archive Wayback-Machine]]

CROSSREFS

See A000170 for further information.

Sequence in context: A189878 A189869 A054790 * A000170 A038216 A213603

Adjacent sequences: A140390 A140391 A140392 * A140394 A140395 A140396

KEYWORD

dead

AUTHOR

N. J. A. Sloane, Jun 18 2008

EXTENSIONS

a(24) is probably mistaken. - Thomas B. Preußer, Nov 07 2008

STATUS

approved