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 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 9 |
| 6 | 15 |
| 7 | 21 |
| 8 | 35 |
| 9 | 71 |
| 10 | 143 |
| 11 | 291 |
| 12 | 635 |
| 13 | 1407 |
| 14 | 2979 |
| 15 | 6101 |
| 16 | 12339 |
| 17 | 25019 |
| 18 | 50413 |
| 19 | 101339 |
| 20 | 202793 |
| 21 | 405745 |
| 22 | 811365 |
| 23 | 1624043 |
| 24 | 3249293 |
| 25 | 6502711 |
| 26 | 13011309 |