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 | 4 |
| 3 | 56 |
| 4 | 20 |
| 5 | 120 |
| 6 | 280 |
| 7 | 560 |
| 8 | 840 |
| 9 | 1680 |
| 10 | 10920 |
| 11 | 9240 |
| 12 | 18480 |
| 13 | 55440 |
| 14 | 120120 |
| 15 | 240240 |
| 16 | 314160 |
| 17 | 628320 |
| 18 | 1441440 |
| 19 | 2282280 |
| 20 | 7225680 |
| 21 | 4564560 |
| 22 | 9129120 |
| 23 | 13693680 |
| 24 | 27387360 |
| 25 | 54774720 |
| 26 | 68468400 |
| 27 | 77597520 |
| 28 | 136936800 |
| 29 | 155195040 |
| 30 | 310390080 |
| 31 | 465585120 |
| 32 | 775975200 |
| 33 | 1163962800 |