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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 51 |
| 5 | 188 |
| 6 | 702 |
| 7 | 2644 |
| 8 | 10026 |
| 9 | 38223 |
| 10 | 146359 |
| 11 | 562456 |
| 12 | 2168134 |
| 13 | 8379539 |
| 14 | 32459199 |
| 15 | 125984039 |
| 16 | 489837300 |
| 17 | 1907490728 |
| 18 | 7438346255 |
| 19 | 29042470132 |
| 20 | 113522618066 |
| 21 | 444199913556 |
| 22 | 1739735079466 |
| 23 | 6819657196928 |
| 24 | 26753893533257 |
| 25 | 105034060120469 |
| 26 | 412637434996367 |