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 | 1 |
| 2 | 1320 |
| 3 | 1640 |
| 4 | 1768 |
| 5 | 1996 |
| 6 | 2640 |
| 7 | 3960 |
| 8 | 13200 |
| 9 | 16400 |
| 10 | 19984 |
| 11 | 19996 |
| 12 | 26400 |
| 13 | 39600 |
| 14 | 132000 |
| 15 | 164000 |
| 16 | 199996 |
| 17 | 264000 |
| 18 | 396000 |
| 19 | 1320000 |
| 20 | 1640000 |
| 21 | 1999936 |
| 22 | 2640000 |
| 23 | 3960000 |
| 24 | 13200000 |
| 25 | 16400000 |
| 26 | 16666240 |
| 27 | 17999488 |
| 28 | 18515584 |
| 29 | 19999984 |
| 30 | 19999996 |