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 | 1 |
| 3 | 6 |
| 4 | 30 |
| 5 | 36 |
| 6 | 540 |
| 7 | 2100 |
| 8 | 3780 |
| 9 | 15120 |
| 10 | 37800 |
| 11 | 85680 |
| 12 | 120960 |
| 13 | 126000 |
| 14 | 131040 |
| 15 | 196560 |
| 16 | 302400 |
| 17 | 332640 |
| 18 | 786240 |
| 19 | 917280 |
| 20 | 1179360 |
| 21 | 2702700 |
| 22 | 3341520 |
| 23 | 4324320 |
| 24 | 8648640 |
| 25 | 19656000 |
| 26 | 19958400 |
| 27 | 21205800 |
| 28 | 43243200 |
| 29 | 46781280 |
| 30 | 57657600 |
| 31 | 64864800 |
| 32 | 122522400 |
| 33 | 151351200 |