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 | 26 |
| 2 | 334 |
| 3 | 2951 |
| 4 | 20641 |
| 5 | 123216 |
| 6 | 656683 |
| 7 | 3217526 |
| 8 | 14786816 |
| 9 | 64657546 |
| 10 | 271838823 |
| 11 | 1107586989 |
| 12 | 4399926007 |
| 13 | 17122243560 |
| 14 | 65514790830 |
| 15 | 247212893755 |
| 16 | 922136438698 |
| 17 | 3406871213836 |
| 18 | 12486569116765 |
| 19 | 45459575562313 |
| 20 | 164578100859837 |
| 21 | 593025025473647 |
| 22 | 2128399709975819 |
| 23 | 7613495897772440 |