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) |
|---|---|
| 6 | 1 |
| 7 | 11 |
| 8 | 75 |
| 9 | 410 |
| 10 | 1975 |
| 11 | 8778 |
| 12 | 36938 |
| 13 | 149501 |
| 14 | 587951 |
| 15 | 2262375 |
| 16 | 8558854 |
| 17 | 31945379 |
| 18 | 117939506 |
| 19 | 431530926 |
| 20 | 1567159901 |
| 21 | 5655480303 |
| 22 | 20299352107 |
| 23 | 72522832282 |
| 24 | 258054207727 |
| 25 | 914973048634 |
| 26 | 3234061126690 |
| 27 | 11399437533757 |
| 28 | 40081465493919 |
| 29 | 140617625960143 |
| 30 | 492342898340494 |