A140450 - cp's OEIS frontend

A140450 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.

n	a(n)
1	1
2	6
3	18
4	26
5	15
6	171
7	42
8	876
9	333
10	975
11	517
12	3066
13	1365
14	26495
15	20280
16	160712
17	91222
18	743229
19	48184
20	3992510
21	179592
22	38217905
23	584591
24	9878316
25	1216775
26	10339849
27	12263400
28	84175966
29	44434525
30	1692888135
31	408773285
32	2799725104
33	4618568460

[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]

cp's OEIS Frontend

A140450 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.

Table of values

List of values