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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 7 |
| 5 | 41 |
| 6 | 48 |
| 7 | 281 |
| 8 | 329 |
| 9 | 1926 |
| 10 | 2255 |
| 11 | 13201 |
| 12 | 15456 |
| 13 | 90481 |
| 14 | 105937 |
| 15 | 620166 |
| 16 | 726103 |
| 17 | 4250681 |
| 18 | 4976784 |
| 19 | 29134601 |
| 20 | 34111385 |
| 21 | 199691526 |
| 22 | 233802911 |
| 23 | 1368706081 |
| 24 | 1602508992 |
| 25 | 9381251041 |
| 26 | 10983760033 |
| 27 | 64300051206 |
| 28 | 75283811239 |