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 | 5 |
| 2 | 35 |
| 3 | 260 |
| 4 | 1805 |
| 5 | 12376 |
| 6 | 83175 |
| 7 | 550775 |
| 8 | 3600400 |
| 9 | 23276175 |
| 10 | 149012380 |
| 11 | 945726575 |
| 12 | 5955676150 |
| 13 | 37243117575 |
| 14 | 231412658225 |
| 15 | 1429522303905 |
| 16 | 8783382129825 |
| 17 | 53700395135475 |
| 18 | 326809026132350 |
| 19 | 1980383108328950 |
| 20 | 11952682268739660 |
| 21 | 71870696616619250 |
| 22 | 430632502970026125 |