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 | 5 |
| 4 | 6 |
| 5 | 35 |
| 6 | 321 |
| 7 | 677 |
| 8 | 4383 |
| 9 | 22592 |
| 10 | 72159 |
| 11 | 383387 |
| 12 | 3139255 |
| 13 | 28636682 |
| 14 | 203596029 |
| 15 | 1861000943 |
| 16 | 5786598858 |
| 17 | 13434198659 |
| 18 | 46089194835 |
| 19 | 382147757339 |
| 20 | 1574680224191 |
| 21 | 9830229102485 |
| 22 | 21235138429161 |
| 23 | 137241059677451 |
| 24 | 570199377138965 |
| 25 | 1847839191094346 |