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 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 59 |
| 6 | 246 |
| 7 | 1105 |
| 8 | 5270 |
| 9 | 26231 |
| 10 | 135036 |
| 11 | 713898 |
| 12 | 3857113 |
| 13 | 21220020 |
| 14 | 118547774 |
| 15 | 671074583 |