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) |
|---|---|
| 2 | 15 |
| 3 | 120 |
| 4 | 510 |
| 5 | 1560 |
| 6 | 3885 |
| 7 | 8400 |
| 8 | 16380 |
| 9 | 29520 |
| 10 | 49995 |
| 11 | 80520 |
| 12 | 124410 |
| 13 | 185640 |
| 14 | 268905 |
| 15 | 379680 |
| 16 | 524280 |
| 17 | 709920 |
| 18 | 944775 |
| 19 | 1238040 |
| 20 | 1599990 |
| 21 | 2042040 |
| 22 | 2576805 |
| 23 | 3218160 |
| 24 | 3981300 |
| 25 | 4882800 |
| 26 | 5940675 |
| 27 | 7174440 |
| 28 | 8605170 |
| 29 | 10255560 |
| 30 | 12149985 |