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 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 36 |
| 5 | 60 |
| 6 | 840 |
| 7 | 3360 |
| 8 | 48720 |
| 9 | 317520 |
| 10 | 4112640 |
| 11 | 36923040 |
| 12 | 503616960 |
| 13 | 5976210240 |
| 14 | 89132883840 |
| 15 | 1287955468800 |
| 16 | 21130876166400 |
| 17 | 353720208441600 |
| 18 | 6424780602240000 |
| 19 | 121392008337600000 |
| 20 | 2435685015296332800 |
| 21 | 51056321187692620800 |
| 22 | 1124423866880349235200 |