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 | 4 |
| 3 | 9 |
| 4 | 19 |
| 5 | 43 |
| 6 | 93 |
| 7 | 212 |
| 8 | 466 |
| 9 | 1070 |
| 10 | 2382 |
| 11 | 5506 |
| 12 | 12386 |
| 13 | 28800 |
| 14 | 65356 |
| 15 | 152745 |
| 16 | 349183 |
| 17 | 819639 |
| 18 | 1885361 |
| 19 | 4441719 |
| 20 | 10270279 |
| 21 | 24269629 |
| 22 | 56363319 |
| 23 | 133529869 |
| 24 | 311255601 |
| 25 | 738947515 |
| 26 | 1727873793 |
| 27 | 4109314729 |
| 28 | 9634406661 |
| 29 | 22946573863 |