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 | 1 |
| 4 | 1 |
| 5 | 6 |
| 6 | 37 |
| 7 | 148 |
| 8 | 449 |
| 9 | 1135 |
| 10 | 15121 |
| 11 | 172789 |
| 12 | 1207009 |
| 13 | 6106816 |
| 14 | 24748725 |
| 15 | 510855346 |
| 16 | 8524169473 |
| 17 | 84981641837 |
| 18 | 602009065729 |
| 19 | 3357322881625 |
| 20 | 93871272204481 |
| 21 | 2059974308136466 |
| 22 | 26683062726210661 |
| 23 | 243032907824598816 |
| 24 | 1725747644222610625 |