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 | 90 |
| 2 | 1260 |
| 3 | 4920 |
| 4 | 13320 |
| 5 | 30492 |
| 6 | 55860 |
| 7 | 94680 |
| 8 | 156240 |
| 9 | 232770 |
| 10 | 332640 |
| 11 | 471240 |
| 12 | 636480 |
| 13 | 835020 |
| 14 | 1098900 |
| 15 | 1391040 |
| 16 | 1720800 |
| 17 | 2181780 |
| 18 | 2614260 |
| 19 | 3118680 |
| 20 | 3889962 |
| 21 | 4519140 |
| 22 | 5207760 |
| 23 | 6237000 |
| 24 | 7208640 |
| 25 | 8274510 |
| 26 | 9585000 |
| 27 | 10816560 |
| 28 | 12215520 |
| 29 | 14153760 |