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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.

A213821 Rectangular array: (row n) = b**c, where b(h) = 3*h-1, c(h) = n-1+h, n>=1, h>=1, and ** = convolution.

Table of values

n a(n)
1 2
2 9
3 4
4 24
5 16
6 6
7 50
8 39
9 23
10 8
11 90
12 76
13 54
14 30
15 10
16 147
17 130
18 102
19 69
20 37
21 12
22 224
23 204
24 170
25 128
26 84
27 44
28 14
29 324
30 301
31 261
32 210
33 154
34 99
35 51
36 16
37 450
38 424
39 378
40 318
41 250
42 180
43 114
44 58
45 18
46 605
47 576
48 524
49 455
50 375
51 290
52 206

List of values

[2, 9, 4, 24, 16, 6, 50, 39, 23, 8, 90, 76, 54, 30, 10, 147, 130, 102, 69, 37, 12, 224, 204, 170, 128, 84, 44, 14, 324, 301, 261, 210, 154, 99, 51, 16, 450, 424, 378, 318, 250, 180, 114, 58, 18, 605, 576, 524, 455, 375, 290, 206]