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 | 20 |
| 2 | 505 |
| 3 | 14090 |
| 4 | 415654 |
| 5 | 12706406 |
| 6 | 398165665 |
| 7 | 12706132610 |
| 8 | 411175121230 |
| 9 | 13453601230544 |
| 10 | 444162996339226 |
| 11 | 14772945441872060 |
| 12 | 494426375286105640 |
| 13 | 16635957551869533770 |
| 14 | 562327513989662942929 |
| 15 | 19084061209362462745826 |