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 | 9 |
| 3 | 510 |
| 4 | 12348 |
| 5 | 351258 |
| 6 | 9806292 |
| 7 | 276018090 |
| 8 | 7769376972 |
| 9 | 218915964618 |
| 10 | 6169925169414 |
| 11 | 173923080282474 |
| 12 | 4903042542453720 |
| 13 | 138226113213225360 |
| 14 | 3896923927019062734 |
| 15 | 109864493967924549384 |
| 16 | 3097380080814655131414 |
| 17 | 87323767337933601800838 |
| 18 | 2461902328199084994926838 |