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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 34 |
| 7 | 90 |
| 8 | 236 |
| 9 | 621 |
| 10 | 1629 |
| 11 | 4274 |
| 12 | 11193 |
| 13 | 29337 |
| 14 | 76818 |
| 15 | 201173 |
| 16 | 526730 |
| 17 | 1379178 |
| 18 | 3610804 |
| 19 | 9453695 |
| 20 | 24750281 |
| 21 | 64798235 |
| 22 | 169644626 |
| 23 | 444138288 |
| 24 | 1162770238 |
| 25 | 3044180080 |
| 26 | 7969770106 |
| 27 | 20865148382 |
| 28 | 54625676431 |
| 29 | 143011928942 |