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 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 41 |
| 6 | 85 |
| 7 | 173 |
| 8 | 349 |
| 9 | 701 |
| 10 | 1405 |
| 11 | 2813 |
| 12 | 5629 |
| 13 | 11261 |
| 14 | 22525 |
| 15 | 45053 |
| 16 | 90113 |
| 17 | 180232 |
| 18 | 360466 |
| 19 | 720937 |
| 20 | 1441877 |
| 21 | 2883761 |
| 22 | 5767525 |
| 23 | 11535053 |
| 24 | 23070112 |
| 25 | 46140228 |
| 26 | 92280457 |
| 27 | 184560921 |
| 28 | 369121849 |
| 29 | 738243700 |
| 30 | 1476487402 |
| 31 | 2952974809 |
| 32 | 5905949620 |
| 33 | 11811899241 |