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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.

A213753 Rectangular array: (row n) = b**c, where b(h) = 2*h-1, c(h) = -1 + 2^(n-1+h), n>=1, h>=1, and ** = convolution.

Table of values

n a(n)
1 1
2 6
3 3
4 21
5 16
6 7
7 58
8 51
9 36
10 15
11 141
12 132
13 111
14 76
15 31
16 318
17 307
18 280
19 231
20 156
21 63
22 685
23 672
24 639
25 576
26 471
27 316
28 127
29 1434
30 1419
31 1380
32 1303
33 1168
34 951
35 636
36 255
37 2949
38 2932
39 2887
40 2796
41 2631
42 2352
43 1911
44 1276
45 511
46 5998
47 5979
48 5928
49 5823

List of values

[1, 6, 3, 21, 16, 7, 58, 51, 36, 15, 141, 132, 111, 76, 31, 318, 307, 280, 231, 156, 63, 685, 672, 639, 576, 471, 316, 127, 1434, 1419, 1380, 1303, 1168, 951, 636, 255, 2949, 2932, 2887, 2796, 2631, 2352, 1911, 1276, 511, 5998, 5979, 5928, 5823]