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 | 3 |
| 2 | 24 |
| 3 | 297 |
| 4 | 5001 |
| 5 | 106578 |
| 6 | 2748399 |
| 7 | 83182347 |
| 8 | 2890153626 |
| 9 | 113364686403 |
| 10 | 4954547485149 |
| 11 | 238734066994272 |
| 12 | 12573018414279501 |
| 13 | 718498413957515103 |
| 14 | 44278797576715884024 |
| 15 | 2927171415480872824197 |
| 16 | 206625238881832412874501 |
| 17 | 15511299587628626891270178 |