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.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 3 |
| 5 | 21 |
| 6 | 19 |
| 7 | 71 |
| 8 | 17 |
| 9 | 265 |
| 10 | 261 |
| 11 | 1035 |
| 12 | 515 |
| 13 | 4109 |
| 14 | 4103 |
| 15 | 16399 |
| 16 | 2049 |
| 17 | 65553 |
| 18 | 65545 |
| 19 | 262163 |
| 20 | 131077 |
| 21 | 1048597 |
| 22 | 1048587 |
| 23 | 4194327 |
| 24 | 1048579 |
| 25 | 16777241 |
| 26 | 16777229 |
| 27 | 67108891 |
| 28 | 33554439 |
| 29 | 268435485 |
| 30 | 268435471 |
| 31 | 1073741855 |
| 32 | 67108865 |
| 33 | 4294967329 |
| 34 | 4294967313 |