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 | 3 |
| 1 | 5 |
| 2 | 11 |
| 3 | 23 |
| 4 | 59 |
| 5 | 137 |
| 6 | 313 |
| 7 | 727 |
| 8 | 1621 |
| 9 | 3673 |
| 10 | 8167 |
| 11 | 17881 |
| 12 | 38891 |
| 13 | 84047 |
| 14 | 180511 |
| 15 | 386117 |
| 16 | 821647 |
| 17 | 1742539 |
| 18 | 3681149 |
| 19 | 7754081 |
| 20 | 16290073 |
| 21 | 34136059 |
| 22 | 71378603 |
| 23 | 148948141 |
| 24 | 310248251 |
| 25 | 645155227 |
| 26 | 1339484207 |
| 27 | 2777105131 |
| 28 | 5750079077 |