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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.

A308359 Triangle T(n,w) read by rows: the number of fixed polyominoes with n cells and width w of the convex hull.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 4
6 1
7 1
8 9
9 8
10 1
11 1
12 18
13 31
14 12
15 1
16 1
17 35
18 95
19 68
20 16
21 1
22 1
23 66
24 269
25 282
26 121
27 20
28 1
29 1
30 123
31 721
32 1027
33 638
34 190
35 24
36 1
37 1
38 228
39 1866
40 3468
41 2817
42 1226
43 275
44 28
45 1
46 1
47 421
48 4728
49 11132
50 11254
51 6391
52 2110
53 376
54 32
55 1
56 1
57 776
58 11804
59 34558
60 42099
61 29388
62 12758
63 3354
64 493
65 36
66 1

List of values

[1, 1, 1, 1, 4, 1, 1, 9, 8, 1, 1, 18, 31, 12, 1, 1, 35, 95, 68, 16, 1, 1, 66, 269, 282, 121, 20, 1, 1, 123, 721, 1027, 638, 190, 24, 1, 1, 228, 1866, 3468, 2817, 1226, 275, 28, 1, 1, 421, 4728, 11132, 11254, 6391, 2110, 376, 32, 1, 1, 776, 11804, 34558, 42099, 29388, 12758, 3354, 493, 36, 1]