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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.

A193871 Square array T(n,k) = k^n - k + 1 read by antidiagonals.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 1
7 1
8 7
9 7
10 1
11 1
12 15
13 25
14 13
15 1
16 1
17 31
18 79
19 61
20 21
21 1
22 1
23 63
24 241
25 253
26 121
27 31
28 1
29 1
30 127
31 727
32 1021
33 621
34 211
35 43
36 1
37 1
38 255
39 2185
40 4093
41 3121
42 1291
43 337
44 57
45 1
46 1
47 511
48 6559
49 16381
50 15621
51 7771
52 2395
53 505
54 73
55 1
56 1
57 1023
58 19681
59 65533
60 78121
61 46651
62 16801
63 4089
64 721
65 91
66 1

List of values

[1, 1, 1, 1, 3, 1, 1, 7, 7, 1, 1, 15, 25, 13, 1, 1, 31, 79, 61, 21, 1, 1, 63, 241, 253, 121, 31, 1, 1, 127, 727, 1021, 621, 211, 43, 1, 1, 255, 2185, 4093, 3121, 1291, 337, 57, 1, 1, 511, 6559, 16381, 15621, 7771, 2395, 505, 73, 1, 1, 1023, 19681, 65533, 78121, 46651, 16801, 4089, 721, 91, 1]