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 | 20 |
| 3 | 69 |
| 4 | 154 |
| 5 | 752 |
| 6 | 3145 |
| 7 | 10131 |
| 8 | 37929 |
| 9 | 150388 |
| 10 | 546267 |
| 11 | 2000770 |
| 12 | 7586016 |
| 13 | 28281649 |
| 14 | 104554687 |
| 15 | 390572927 |
| 16 | 1458526512 |
| 17 | 5423019339 |
| 18 | 20199712660 |
| 19 | 75329388620 |
| 20 | 280578366045 |
| 21 | 1045017557629 |
| 22 | 3894288535989 |
| 23 | 14509490578040 |
| 24 | 54051253212923 |