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 | 0 |
| 1 | 0 |
| 2 | 3 |
| 3 | 8 |
| 4 | 5 |
| 5 | 805 |
| 6 | 1689 |
| 7 | 12317 |
| 8 | 197209 |
| 9 | 520852 |
| 10 | 4493819 |
| 11 | 16769097 |
| 12 | 2053077332 |
| 13 | 1110380591 |
| 14 | 39230711849 |
| 15 | 516641987008 |
| 16 | 62653098988435 |
| 17 | 398166000236882 |
| 18 | 7896283077809532 |
| 19 | 99956735615338266 |
| 20 | 5161719458617927763 |
| 21 | 63295038588725505792 |
| 22 | 659220983938327840981 |