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 | 22 |
| 3 | 132 |
| 4 | 1006 |
| 5 | 4324 |
| 6 | 26996 |
| 7 | 109722 |
| 8 | 602804 |
| 9 | 2434670 |
| 10 | 12287118 |
| 11 | 49852352 |
| 12 | 237425498 |
| 13 | 969300694 |
| 14 | 4434629912 |
| 15 | 18203944458 |
| 16 | 80978858522 |
| 17 | 333840165288 |
| 18 | 1456084764388 |
| 19 | 6021921661718 |
| 20 | 25904211802080 |