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 | 9 |
| 2 | 61 |
| 3 | 377 |
| 4 | 2241 |
| 5 | 13073 |
| 6 | 75517 |
| 7 | 433905 |
| 8 | 2485825 |
| 9 | 14218905 |
| 10 | 81270333 |
| 11 | 464387817 |
| 12 | 2653649025 |
| 13 | 15167050785 |
| 14 | 86716873725 |
| 15 | 495998874593 |
| 16 | 2838240338817 |
| 17 | 16248650965289 |
| 18 | 93065296937533 |
| 19 | 533285164334169 |
| 20 | 3057236753252161 |
| 21 | 17534423944871729 |
| 22 | 100609937775369981 |