cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A357740 Number of non-equivalent ways under symmetry in one axis that 2 non-attacking kings of different colors can be placed on an n X n board.

Table of values

n a(n)
1 0
2 0
3 17
4 78
5 234
6 520
7 1035
8 1806
9 2996
10 4608
11 6885
12 9790
13 13662
14 18408
15 24479
16 31710
17 40680
18 51136
19 63801
20 78318
21 95570
22 115080
23 137907
24 163438
25 192924
26 225600
27 262925
28 303966
29 350406
30 401128
31 458055
32 519870
33 588752
34 663168
35 745569
36 834190
37 931770
38 1036296
39 1150811
40 1273038

List of values

[0, 0, 17, 78, 234, 520, 1035, 1806, 2996, 4608, 6885, 9790, 13662, 18408, 24479, 31710, 40680, 51136, 63801, 78318, 95570, 115080, 137907, 163438, 192924, 225600, 262925, 303966, 350406, 401128, 458055, 519870, 588752, 663168, 745569, 834190, 931770, 1036296, 1150811, 1273038]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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