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 | 17 |
| 3 | 67 |
| 4 | 241 |
| 5 | 739 |
| 6 | 2063 |
| 7 | 5441 |
| 8 | 13693 |
| 9 | 34351 |
| 10 | 83617 |
| 11 | 198479 |
| 12 | 465337 |
| 13 | 1076401 |
| 14 | 2461873 |
| 15 | 5582917 |
| 16 | 12548171 |
| 17 | 28018649 |
| 18 | 62133769 |
| 19 | 137034913 |
| 20 | 300736621 |
| 21 | 656953343 |
| 22 | 1429360349 |
| 23 | 3098240417 |
| 24 | 6692967079 |
| 25 | 14414137427 |
| 26 | 30952936639 |
| 27 | 66293412113 |
| 28 | 141636592337 |
| 29 | 301924957273 |