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 | 2 |
| 2 | 12 |
| 3 | 114 |
| 4 | 1446 |
| 5 | 22722 |
| 6 | 424302 |
| 7 | 9168162 |
| 8 | 224961774 |
| 9 | 6180211842 |
| 10 | 187977996366 |
| 11 | 6272676296034 |
| 12 | 227890380810606 |
| 13 | 8955881754461250 |
| 14 | 378593286191735694 |
| 15 | 17131977268344445218 |
| 16 | 826338384025220612526 |
| 17 | 42323768184940929568770 |