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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 20 |
| 5 | 41 |
| 6 | 82 |
| 7 | 165 |
| 8 | 330 |
| 9 | 661 |
| 10 | 1322 |
| 11 | 2645 |
| 12 | 5290 |
| 13 | 10581 |
| 14 | 21162 |
| 15 | 42325 |
| 16 | 84650 |
| 17 | 169301 |
| 18 | 338602 |
| 19 | 677205 |
| 20 | 1354410 |
| 21 | 2708821 |
| 22 | 5417642 |
| 23 | 10835285 |
| 24 | 21670570 |
| 25 | 43341141 |
| 26 | 86682282 |
| 27 | 173364565 |
| 28 | 346729130 |
| 29 | 693458261 |
| 30 | 1386916522 |
| 31 | 2773833045 |
| 32 | 5547666090 |
| 33 | 11095332181 |