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) |
|---|---|
| 2 | 6 |
| 3 | 12 |
| 4 | 25 |
| 5 | 48 |
| 6 | 94 |
| 7 | 184 |
| 8 | 363 |
| 9 | 719 |
| 10 | 1430 |
| 11 | 2851 |
| 12 | 5691 |
| 13 | 11371 |
| 14 | 22728 |
| 15 | 45443 |
| 16 | 90870 |
| 17 | 181724 |
| 18 | 363429 |
| 19 | 726839 |
| 20 | 1453658 |
| 21 | 2907295 |
| 22 | 5814566 |
| 23 | 11629107 |