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 | 25 |
| 2 | 445 |
| 3 | 7140 |
| 4 | 111769 |
| 5 | 1767087 |
| 6 | 28699460 |
| 7 | 483004280 |
| 8 | 8460980836 |
| 9 | 154594537812 |
| 10 | 2948470152264 |
| 11 | 58696064973000 |
| 12 | 1219007251826064 |
| 13 | 26390216795274288 |
| 14 | 594982297852020288 |
| 15 | 13955257961738192448 |
| 16 | 340154857108405040256 |
| 17 | 8606960634143667938688 |