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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 60 |
| 5 | 61 |
| 6 | 62 |
| 7 | 200 |
| 8 | 417 |
| 9 | 2687 |
| 10 | 1536009 |
| 11 | 57157270 |
| 12 | 81436635 |
| 13 | 143005063 |
| 14 | 706132910 |
| 15 | 2016118929 |