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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.

A176202 Convolution triangle, row sums = A000041. M = A000041 in each column with two interleaved zeros; Q = A000726 diagonalized with the rest zeros. A176202 = M*Q.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 0
5 2
6 1
7 0
8 0
9 2
10 0
11 1
12 0
13 0
14 4
15 0
16 0
17 2
18 0
19 0
20 5
21 2
22 0
23 0
24 2
25 0
26 0
27 7
28 0
29 2
30 0
31 0
32 4
33 0
34 0
35 9
36 0
37 0
38 4
39 0
40 0
41 5
42 0
43 0
44 13
45 3
46 0
47 0
48 4
49 0
50 0
51 7
52 0
53 0
54 16
55 0
56 3
57 0
58 0
59 8
60 0
61 0
62 9
63 0
64 0
65 22
66 0
67 0
68 6
69 0
70 0
71 10
72 0
73 0
74 13
75 0
76 0
77 27

List of values

[1, 0, 1, 0, 0, 2, 1, 0, 0, 2, 0, 1, 0, 0, 4, 0, 0, 2, 0, 0, 5, 2, 0, 0, 2, 0, 0, 7, 0, 2, 0, 0, 4, 0, 0, 9, 0, 0, 4, 0, 0, 5, 0, 0, 13, 3, 0, 0, 4, 0, 0, 7, 0, 0, 16, 0, 3, 0, 0, 8, 0, 0, 9, 0, 0, 22, 0, 0, 6, 0, 0, 10, 0, 0, 13, 0, 0, 27]

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