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 | 6 |
| 3 | 21 |
| 4 | 93 |
| 5 | 698 |
| 6 | 5377 |
| 7 | 48198 |
| 8 | 483817 |
| 9 | 5231438 |
| 10 | 61160870 |
| 11 | 774696437 |
| 12 | 10552025533 |
| 13 | 153901234789 |