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) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 34 |
| 4 | 182 |
| 5 | 836 |
| 6 | 4025 |
| 7 | 19001 |
| 8 | 90358 |
| 9 | 428481 |
| 10 | 2034035 |
| 11 | 9651787 |
| 12 | 45806244 |
| 13 | 217378076 |
| 14 | 1031612713 |
| 15 | 4895689348 |
| 16 | 23233383508 |
| 17 | 110258103799 |
| 18 | 523249458736 |
| 19 | 2483172990911 |
| 20 | 11784338112247 |
| 21 | 55924666344750 |
| 22 | 265400424550505 |
| 23 | 1259504788813791 |
| 24 | 5977203382848010 |