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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.

A213756 Rectangular array: (row n) = b**c, where b(h) = -1 + 2^h, c(h) = 2*n - 3 + 2*h, n>=1, h>=1, and ** = convolution.

Table of values

n a(n)
1 1
2 6
3 3
4 21
5 14
6 5
7 58
8 43
9 22
10 7
11 141
12 110
13 65
14 30
15 9
16 318
17 255
18 162
19 87
20 38
21 11
22 685
23 558
24 369
25 214
26 109
27 46
28 13
29 1434
30 1179
31 798
32 483
33 266
34 131
35 54
36 15
37 2949
38 2438
39 1673
40 1038
41 597
42 318
43 153
44 62
45 17
46 5998
47 4975
48 3442
49 2167
50 1278
51 711
52 370
53 175
54 70

List of values

[1, 6, 3, 21, 14, 5, 58, 43, 22, 7, 141, 110, 65, 30, 9, 318, 255, 162, 87, 38, 11, 685, 558, 369, 214, 109, 46, 13, 1434, 1179, 798, 483, 266, 131, 54, 15, 2949, 2438, 1673, 1038, 597, 318, 153, 62, 17, 5998, 4975, 3442, 2167, 1278, 711, 370, 175, 70]