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 | 5 |
| 3 | 29 |
| 4 | 157 |
| 5 | 901 |
| 6 | 4822 |
| 7 | 27447 |
| 8 | 149393 |
| 9 | 836527 |
| 10 | 4610088 |
| 11 | 25846123 |
| 12 | 142296551 |
| 13 | 799268609 |
| 14 | 4426204933 |
| 15 | 24808065829 |
| 16 | 137945151360 |
| 17 | 773962487261 |
| 18 | 4310815784117 |
| 19 | 24208263855765 |