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 | 3 |
| 2 | 15 |
| 3 | 63 |
| 4 | 189 |
| 5 | 432 |
| 6 | 792 |
| 7 | 1232 |
| 8 | 1584 |
| 9 | 2880 |
| 10 | 4320 |
| 11 | 5040 |
| 12 | 6336 |
| 13 | 7920 |
| 14 | 12096 |
| 15 | 15120 |
| 16 | 19008 |
| 17 | 22176 |
| 18 | 30240 |
| 19 | 33264 |
| 20 | 43200 |
| 21 | 47520 |
| 22 | 44352 |
| 23 | 65520 |
| 24 | 75600 |
| 25 | 108000 |
| 26 | 90720 |
| 27 | 120960 |
| 28 | 168480 |
| 29 | 131040 |
| 30 | 151200 |
| 31 | 181440 |
| 32 | 252000 |
| 33 | 196560 |
| 34 | 221760 |
| 35 | 237600 |
| 36 | 362880 |
| 37 | 403200 |
| 38 | 302400 |