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 | 5 |
| 1 | 24 |
| 2 | 112 |
| 3 | 521 |
| 4 | 2421 |
| 5 | 11248 |
| 6 | 52256 |
| 7 | 242769 |
| 8 | 1127845 |
| 9 | 5239688 |
| 10 | 24342288 |
| 11 | 113088217 |
| 12 | 525379733 |
| 13 | 2440783584 |
| 14 | 11339273536 |
| 15 | 52679444897 |
| 16 | 244735600197 |
| 17 | 1136980735480 |
| 18 | 5282129742512 |
| 19 | 24539461176489 |
| 20 | 114004233933493 |
| 21 | 529635319263440 |
| 22 | 2460553978854240 |