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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 27 |
| 6 | 62 |
| 7 | 125 |
| 8 | 266 |
| 9 | 538 |
| 10 | 1106 |
| 11 | 2213 |
| 12 | 4509 |
| 13 | 9019 |
| 14 | 18166 |
| 15 | 36365 |
| 16 | 73012 |
| 17 | 146025 |
| 18 | 292658 |
| 19 | 585317 |
| 20 | 1171783 |
| 21 | 2343697 |
| 22 | 4689610 |
| 23 | 9379221 |
| 24 | 18763300 |
| 25 | 37526628 |
| 26 | 75062278 |
| 27 | 150125100 |
| 28 | 300268507 |
| 29 | 600537015 |
| 30 | 1201111598 |
| 31 | 2402223197 |