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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.

A273895 T(n, k) is the number of Horizontal Convex Polyominoes with n cells and k rows.

Table of values

n a(n)
0 0
1 0
2 1
3 0
4 1
5 1
6 0
7 1
8 4
9 1
10 0
11 1
12 9
13 8
14 1
15 0
16 1
17 16
18 31
19 12
20 1
21 0
22 1
23 25
24 85
25 68
26 16
27 1
28 0
29 1
30 36
31 190
32 260
33 121
34 20
35 1
36 0
37 1
38 49
39 371
40 777
41 604
42 190
43 24
44 1
45 0
46 1
47 64
48 658
49 1960
50 2299
51 1180
52 275
53 28
54 1
55 0
56 1
57 81
58 1086
59 4368
60 7221
61 5509
62 2052
63 376
64 32
65 1
66 0

List of values

[0, 0, 1, 0, 1, 1, 0, 1, 4, 1, 0, 1, 9, 8, 1, 0, 1, 16, 31, 12, 1, 0, 1, 25, 85, 68, 16, 1, 0, 1, 36, 190, 260, 121, 20, 1, 0, 1, 49, 371, 777, 604, 190, 24, 1, 0, 1, 64, 658, 1960, 2299, 1180, 275, 28, 1, 0, 1, 81, 1086, 4368, 7221, 5509, 2052, 376, 32, 1, 0]