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 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 628 |
| 6 | 11524 |
| 7 | 16814 |
| 8 | 188404 |
| 9 | 441484 |
| 10 | 2541014 |
| 11 | 3984724 |
| 12 | 172315684 |
| 13 | 208268941 |
| 14 | 40874725514 |
| 15 | 280454588548 |
| 16 | 489850370956 |
| 17 | 1235856817732 |
| 18 | 62479203805793 |
| 19 | 95467808763364 |
| 20 | 116016015619396 |
| 21 | 396249210287836 |