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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.

A213564 Rectangular array: (row n) = b**c, where b(h) = h*(h+1)/2, c(h) = (n-1+h)^2, n>=1, h>=1, and ** = convolution.

Table of values

n a(n)
1 1
2 7
3 4
4 27
5 21
6 9
7 77
8 67
9 43
10 16
11 182
12 167
13 127
14 73
15 25
16 378
17 357
18 297
19 207
20 111
21 36
22 714
23 686
24 602
25 467
26 307
27 157
28 49
29 1254
30 1218
31 1106
32 917
33 677
34 427
35 211
36 64
37 2079
38 2034
39 1890
40 1638
41 1302
42 927
43 567
44 273
45 81
46 3289
47 3234
48 3054
49 2730
50 2282
51 1757

List of values

[1, 7, 4, 27, 21, 9, 77, 67, 43, 16, 182, 167, 127, 73, 25, 378, 357, 297, 207, 111, 36, 714, 686, 602, 467, 307, 157, 49, 1254, 1218, 1106, 917, 677, 427, 211, 64, 2079, 2034, 1890, 1638, 1302, 927, 567, 273, 81, 3289, 3234, 3054, 2730, 2282, 1757]