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 | 6 |
| 4 | 22 |
| 5 | 98 |
| 6 | 534 |
| 7 | 3334 |
| 8 | 23724 |
| 9 | 191820 |
| 10 | 1704532 |
| 11 | 16689868 |
| 12 | 179288892 |
| 13 | 2069311996 |
| 14 | 25760882744 |
| 15 | 345073745880 |
| 16 | 4900331447624 |