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 | 3 |
| 2 | 10 |
| 3 | 35 |
| 4 | 127 |
| 5 | 472 |
| 6 | 1781 |
| 7 | 6783 |
| 8 | 25978 |
| 9 | 99823 |
| 10 | 384331 |
| 11 | 1481424 |
| 12 | 5714073 |
| 13 | 22048715 |
| 14 | 85098282 |
| 15 | 328485899 |
| 16 | 1268080423 |
| 17 | 4895497064 |
| 18 | 18899853101 |
| 19 | 72967061671 |
| 20 | 281708048154 |
| 21 | 1087611942455 |
| 22 | 4199040207827 |
| 23 | 16211637659168 |