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 | 0 |
| 1 | 2 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 40 |
| 6 | 72 |
| 7 | 126 |
| 8 | 240 |
| 9 | 272 |
| 10 | 336 |
| 11 | 438 |
| 12 | 648 |
| 13 | 906 |
| 14 | 1422 |
| 15 | 2340 |
| 16 | 4320 |
| 17 | 5346 |
| 18 | 7398 |
| 19 | 10668 |
| 20 | 17400 |
| 21 | 27720 |
| 22 | 49896 |
| 23 | 93150 |
| 24 | 196560 |
| 25 | 196656 |