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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 44 |
| 6 | 238 |
| 7 | 1506 |
| 8 | 10960 |
| 9 | 90449 |
| 10 | 834166 |
| 11 | 8496388 |
| 12 | 94738095 |
| 13 | 1148207875 |
| 14 | 15031585103 |
| 15 | 211388932628 |