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 | 1 |
| 3 | 8 |
| 4 | 19 |
| 5 | 49 |
| 6 | 157 |
| 7 | 600 |
| 8 | 2161 |
| 9 | 7479 |
| 10 | 25639 |
| 11 | 88307 |
| 12 | 306281 |
| 13 | 1066691 |
| 14 | 3716461 |
| 15 | 12931923 |
| 16 | 44953528 |
| 17 | 156232914 |
| 18 | 543075295 |
| 19 | 1888104965 |
| 20 | 6564738537 |
| 21 | 22824408491 |
| 22 | 79353796243 |
| 23 | 275886391011 |
| 24 | 959166284191 |
| 25 | 3334724626513 |
| 26 | 11593837466750 |