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 | 3 |
| 3 | 9 |
| 4 | 36 |
| 5 | 168 |
| 6 | 961 |
| 7 | 6403 |
| 8 | 49302 |
| 9 | 430190 |
| 10 | 4199279 |
| 11 | 45326013 |
| 12 | 535867338 |
| 13 | 6884000262 |
| 14 | 95453970483 |
| 15 | 1420538043009 |
| 16 | 22579098396600 |
| 17 | 381704267100888 |
| 18 | 6837775526561031 |
| 19 | 129377310771795789 |
| 20 | 2578101967764973314 |
| 21 | 53965231260126083854 |
| 22 | 1183813954026245944519 |