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 | 2 |
| 3 | 5 |
| 4 | 18 |
| 5 | 100 |
| 6 | 1242 |
| 7 | 43425 |
| 8 | 4925635 |
| 9 | 1678993887 |
| 10 | 1613875721946 |
| 11 | 4293014800909806 |
| 12 | 31574944534364259507 |
| 13 | 644483327087699659771857 |
| 14 | 36676558984788056550610362834 |
| 15 | 5846161177591490590945591554686844 |
| 16 | 2621219060849255874034814155021919844156 |