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) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 33 |
| 5 | 105 |
| 6 | 345 |
| 7 | 1173 |
| 8 | 4097 |
| 9 | 14573 |
| 10 | 52433 |
| 11 | 190653 |
| 12 | 699073 |
| 13 | 2581113 |
| 14 | 9586985 |
| 15 | 35791473 |
| 16 | 134217729 |
| 17 | 505290273 |
| 18 | 1908874585 |
| 19 | 7233629133 |
| 20 | 27487790721 |
| 21 | 104715393913 |
| 22 | 399822410105 |
| 23 | 1529755308213 |
| 24 | 5864062017537 |
| 25 | 22517998136937 |
| 26 | 86607685141745 |