id:A140450 - OEIS Search Results

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The count of how many queens must be placed tentatively onto a board while seeking a first solution to the "N-Queens on an N x N chessboard" puzzle. The term a(4) with the value 26 is the count for a board size of 4 squares by 4 squares. The highest term so far a(45) is the count for a board of 45 squares by 45 squares.

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1, 6, 18, 26, 15, 171, 42, 876, 333, 975, 517, 3066, 1365, 26495, 20280, 160712, 91222, 743229, 48184, 3992510, 179592, 38217905, 584591, 9878316, 1216775, 10339849, 12263400, 84175966, 44434525, 1692888135, 408773285, 2799725104, 4618568460 (list; graph; listen)

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research