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 | 9 |
| 2 | 117 |
| 3 | 1881 |
| 4 | 35505 |
| 5 | 763209 |
| 6 | 18309861 |
| 7 | 483213033 |
| 8 | 13876068609 |
| 9 | 429885495945 |
| 10 | 14269174133301 |
| 11 | 504579048629049 |
| 12 | 18917482749919857 |
| 13 | 748904109963227721 |
| 14 | 31194958415494252005 |
| 15 | 1363010131166317306569 |
| 16 | 62300347592864208824961 |