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 | 4 |
| 3 | 18 |
| 4 | 104 |
| 5 | 770 |
| 6 | 7188 |
| 7 | 71267 |
| 8 | 668712 |
| 9 | 5784858 |
| 10 | 46456730 |
| 11 | 351209716 |
| 12 | 2538926040 |
| 13 | 17934291011 |
| 14 | 128545882129 |
| 15 | 994784980860 |
| 16 | 8902285643456 |