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 | 11 |
| 2 | 105 |
| 3 | 420 |
| 4 | 924 |
| 5 | 2772 |
| 6 | 6240 |
| 7 | 4620 |
| 8 | 18480 |
| 9 | 13860 |
| 10 | 55440 |
| 11 | 69300 |
| 12 | 120120 |
| 13 | 180180 |
| 14 | 240240 |
| 15 | 360360 |
| 16 | 514800 |
| 17 | 720720 |
| 18 | 1029600 |
| 19 | 1801800 |
| 20 | 2162160 |
| 21 | 2522520 |
| 22 | 2282280 |
| 23 | 5045040 |
| 24 | 7207200 |
| 25 | 4564560 |
| 26 | 6846840 |
| 27 | 12612600 |
| 28 | 15135120 |
| 29 | 11411400 |
| 30 | 20540520 |
| 31 | 29343600 |
| 32 | 22822800 |
| 33 | 49729680 |