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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.

A187220 Gullwing sequence (see Comments lines for precise definition).

Table of values

n a(n)
0 0
1 1
2 3
3 7
4 15
5 23
6 31
7 47
8 71
9 87
10 95
11 111
12 135
13 159
14 191
15 247
16 311
17 343
18 351
19 367
20 391
21 415
22 447
23 503
24 567
25 607
26 639
27 695
28 767
29 847
30 967
31 1143
32 1303
33 1367
34 1375
35 1391
36 1415
37 1439
38 1471
39 1527
40 1591
41 1631
42 1663
43 1719
44 1791
45 1871
46 1991
47 2167
48 2327
49 2399
50 2431

List of values

[0, 1, 3, 7, 15, 23, 31, 47, 71, 87, 95, 111, 135, 159, 191, 247, 311, 343, 351, 367, 391, 415, 447, 503, 567, 607, 639, 695, 767, 847, 967, 1143, 1303, 1367, 1375, 1391, 1415, 1439, 1471, 1527, 1591, 1631, 1663, 1719, 1791, 1871, 1991, 2167, 2327, 2399, 2431]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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