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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.

A247498 Generalized Euler numbers: Square array read by descending antidiagonals, T(n, k) = k!*[x^k] exp(n*x)*sech(x), n>=0, k>=0.

Table of values

n a(n)
0 1
1 0
2 1
3 -1
4 1
5 1
6 0
7 0
8 2
9 1
10 5
11 -2
12 3
13 3
14 1
15 0
16 0
17 2
18 8
19 4
20 1
21 -61
22 16
23 -3
24 18
25 15
26 5
27 1
28 0
29 0
30 2
31 32
32 52
33 24
34 6
35 1
36 1385
37 -272
38 63
39 48
40 165
41 110
42 35
43 7
44 1
45 0
46 0
47 2
48 128
49 484
50 480
51 198
52 48
53 8
54 1
55 -50521
56 7936
57 -1383
58 528
59 1395
60 2000
61 1085
62 322
63 63
64 9
65 1

List of values

[1, 0, 1, -1, 1, 1, 0, 0, 2, 1, 5, -2, 3, 3, 1, 0, 0, 2, 8, 4, 1, -61, 16, -3, 18, 15, 5, 1, 0, 0, 2, 32, 52, 24, 6, 1, 1385, -272, 63, 48, 165, 110, 35, 7, 1, 0, 0, 2, 128, 484, 480, 198, 48, 8, 1, -50521, 7936, -1383, 528, 1395, 2000, 1085, 322, 63, 9, 1]