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 | 60 |
| 3 | 396 |
| 4 | 1386 |
| 5 | 3570 |
| 6 | 7650 |
| 7 | 14490 |
| 8 | 25116 |
| 9 | 40716 |
| 10 | 62640 |
| 11 | 92400 |
| 12 | 131670 |
| 13 | 182286 |
| 14 | 246246 |
| 15 | 325710 |
| 16 | 423000 |
| 17 | 540600 |
| 18 | 681156 |
| 19 | 847476 |
| 20 | 1042530 |
| 21 | 1269450 |
| 22 | 1531530 |
| 23 | 1832226 |
| 24 | 2175156 |
| 25 | 2564100 |
| 26 | 3003000 |
| 27 | 3495960 |
| 28 | 4047246 |
| 29 | 4661286 |
| 30 | 5342670 |