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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.

A100711 Table read by antidiagonals: T(m,n) gives the ordinal number in the table of permutations of length n+1 of the permutation which reverses the first m+1 items on a list of length n+1, leaving the remaining items unaltered. For example, T(5,7) is 28494 and the 28494th row of the permutation table of order 8 is 5 4 3 2 1 0 6 7.

Table of values

n a(n)
1 1
2 2
3 0
4 6
5 5
6 0
7 24
8 14
9 0
10 0
11 120
12 54
13 23
14 0
15 0
16 720
17 264
18 86
19 0
20 0
21 0
22 5040
23 1560
24 414
25 119
26 0
27 0
28 0
29 40320
30 10800
31 2424
32 566
33 0
34 0
35 0
36 0
37 85680
38 16680
39 3294
40 719
41 0
42 0
43 0
44 131760
45 22584
46 4166
47 0
48 0
49 0
50 177960
51 28494
52 5039
53 0
54 0
55 224184
56 34406
57 0
58 0
59 270414
60 40319
61 0

List of values

[1, 2, 0, 6, 5, 0, 24, 14, 0, 0, 120, 54, 23, 0, 0, 720, 264, 86, 0, 0, 0, 5040, 1560, 414, 119, 0, 0, 0, 40320, 10800, 2424, 566, 0, 0, 0, 0, 85680, 16680, 3294, 719, 0, 0, 0, 131760, 22584, 4166, 0, 0, 0, 177960, 28494, 5039, 0, 0, 224184, 34406, 0, 0, 270414, 40319, 0]

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