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 | 2 |
| 3 | 6 |
| 4 | 84 |
| 5 | 437 |
| 6 | 1366 |
| 7 | 2390 |
| 8 | 5676 |
| 9 | 47471 |
| 10 | 75972 |
| 11 | 82321 |
| 12 | 99012 |
| 13 | 3015760 |
| 14 | 5667660 |
| 15 | 7881348 |
| 16 | 11498604 |
| 17 | 26118614 |
| 18 | 26447827 |
| 19 | 114092460 |
| 20 | 115426140 |
| 21 | 121197447 |
| 22 | 207767052 |
| 23 | 257342460 |
| 24 | 463216428 |
| 25 | 567155020 |
| 26 | 658286388 |
| 27 | 758280060 |
| 28 | 1013513752 |
| 29 | 1261438248 |
| 30 | 1762803253 |