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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.

A213551 Rectangular array: (row n) = b**c, where b(h) = h*(h+1)/2, c(h) = b(n-1+h), n>=1, h>=1, and ** = convolution.

Table of values

n a(n)
1 1
2 6
3 3
4 21
5 15
6 6
7 56
8 46
9 28
10 10
11 126
12 111
13 81
14 45
15 15
16 252
17 231
18 186
19 126
20 66
21 21
22 462
23 434
24 371
25 281
26 181
27 91
28 28
29 792
30 756
31 672
32 546
33 396
34 246
35 120
36 36
37 1287
38 1242
39 1134
40 966
41 756
42 531
43 321
44 153
45 45
46 2002
47 1947
48 1812
49 1596
50 1316
51 1001
52 686
53 406

List of values

[1, 6, 3, 21, 15, 6, 56, 46, 28, 10, 126, 111, 81, 45, 15, 252, 231, 186, 126, 66, 21, 462, 434, 371, 281, 181, 91, 28, 792, 756, 672, 546, 396, 246, 120, 36, 1287, 1242, 1134, 966, 756, 531, 321, 153, 45, 2002, 1947, 1812, 1596, 1316, 1001, 686, 406]