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 | 30 |
| 2 | 540 |
| 3 | 7560 |
| 4 | 90720 |
| 5 | 979776 |
| 6 | 9797760 |
| 7 | 92378880 |
| 8 | 831409920 |
| 9 | 7205552640 |
| 10 | 60526642176 |
| 11 | 495217981440 |
| 12 | 3961743851520 |
| 13 | 31084451758080 |
| 14 | 239794342133760 |
| 15 | 1822437000216576 |
| 16 | 13668277501624320 |
| 17 | 101306056776744960 |
| 18 | 742911083029463040 |
| 19 | 5395880497792942080 |