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 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 53 |
| 5 | 131 |
| 6 | 311 |
| 7 | 719 |
| 8 | 1619 |
| 9 | 3671 |
| 10 | 8161 |
| 11 | 17863 |
| 12 | 38873 |
| 13 | 84017 |
| 14 | 180503 |
| 15 | 386093 |
| 16 | 821641 |
| 17 | 1742537 |
| 18 | 3681131 |
| 19 | 7754077 |
| 20 | 16290047 |
| 21 | 34136029 |
| 22 | 71378569 |
| 23 | 148948139 |
| 24 | 310248241 |
| 25 | 645155197 |
| 26 | 1339484197 |
| 27 | 2777105129 |
| 28 | 5750079047 |
| 29 | 11891268401 |
| 30 | 24563311309 |
| 31 | 50685770167 |
| 32 | 104484802057 |
| 33 | 215187847711 |