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 | 14 |
| 3 | 84 |
| 4 | 410 |
| 5 | 1820 |
| 6 | 7648 |
| 7 | 31008 |
| 8 | 122584 |
| 9 | 475600 |
| 10 | 1818656 |
| 11 | 6874560 |
| 12 | 25742624 |
| 13 | 95645888 |
| 14 | 353032960 |
| 15 | 1295729664 |
| 16 | 4732541824 |
| 17 | 17211685120 |
| 18 | 62362187264 |
| 19 | 225201546240 |
| 20 | 810825419264 |
| 21 | 2911520685056 |
| 22 | 10429433085952 |