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 | 9 |
| 1 | 10 |
| 2 | 19 |
| 3 | 29 |
| 4 | 135 |
| 5 | 839 |
| 6 | 3491 |
| 7 | 4330 |
| 8 | 7821 |
| 9 | 12151 |
| 10 | 226539 |
| 11 | 238690 |
| 12 | 465229 |
| 13 | 703919 |
| 14 | 3280905 |
| 15 | 20389349 |
| 16 | 84838301 |
| 17 | 105227650 |
| 18 | 190065951 |
| 19 | 295293601 |
| 20 | 5505350769 |
| 21 | 5800644370 |
| 22 | 11305995139 |
| 23 | 17106639509 |
| 24 | 79732553175 |
| 25 | 495501958559 |
| 26 | 2061740387411 |
| 27 | 2557242345970 |