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 | 16 |
| 6 | 55 |
| 7 | 224 |
| 8 | 935 |
| 9 | 4400 |
| 10 | 21262 |
| 11 | 111624 |
| 12 | 596805 |
| 13 | 3457354 |
| 14 | 20147882 |
| 15 | 125455512 |
| 16 | 792576243 |
| 17 | 5277532388 |
| 18 | 35519373064 |
| 19 | 252120178596 |
| 20 | 1800810613940 |
| 21 | 13492153025558 |
| 22 | 102095379031327 |
| 23 | 804122472505530 |
| 24 | 6395239610004277 |