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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.

A049641 a(n) = Sum_{i=0..n} ((-1)^i)*T(i,n-i), array T as in A049639.

Table of values

n a(n)
0 0
1 0
2 2
3 0
4 3
5 0
6 5
7 0
8 7
9 0
10 11
11 0
12 13
13 0
14 19
15 0
16 23
17 0
18 29
19 0
20 33
21 0
22 43
23 0
24 47
25 0
26 59
27 0
28 65
29 0
30 73
31 0
32 81
33 0
34 97
35 0
36 103
37 0
38 121
39 0
40 129
41 0
42 141
43 0
44 151
45 0
46 173
47 0
48 181
49 0
50 201
51 0
52 213
53 0
54 231
55 0
56 243
57 0
58 271
59 0
60 279
61 0
62 309
63 0
64 325
65 0
66 345
67 0
68 361
69 0
70 385

List of values

[0, 0, 2, 0, 3, 0, 5, 0, 7, 0, 11, 0, 13, 0, 19, 0, 23, 0, 29, 0, 33, 0, 43, 0, 47, 0, 59, 0, 65, 0, 73, 0, 81, 0, 97, 0, 103, 0, 121, 0, 129, 0, 141, 0, 151, 0, 173, 0, 181, 0, 201, 0, 213, 0, 231, 0, 243, 0, 271, 0, 279, 0, 309, 0, 325, 0, 345, 0, 361, 0, 385]

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