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 | 4 |
| 5 | 11 |
| 6 | 33 |
| 7 | 121 |
| 8 | 597 |
| 9 | 4017 |
| 10 | 35103 |
| 11 | 428081 |
| 12 | 6851591 |
| 13 | 153025577 |
| 14 | 4535779061 |
| 15 | 187380634552 |