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 | 0 |
| 2 | 8 |
| 3 | 456 |
| 4 | 14312 |
| 5 | 338376 |
| 6 | 7218536 |
| 7 | 148082760 |
| 8 | 2991665384 |
| 9 | 60074332872 |
| 10 | 1203417692264 |
| 11 | 24083810625864 |
| 12 | 481799892270056 |
| 13 | 9636987359949768 |
| 14 | 192747663544965992 |
| 15 | 3855016602355831368 |
| 16 | 77100838700834961128 |
| 17 | 1542020827252644619464 |
| 18 | 30840448970959051746920 |
| 19 | 616809238826486098348872 |