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 | 9 |
| 4 | 18 |
| 5 | 58 |
| 6 | 348 |
| 7 | 1862 |
| 8 | 10188 |
| 9 | 57600 |
| 10 | 376692 |
| 11 | 2640422 |
| 12 | 19469324 |
| 13 | 151978440 |
| 14 | 1258451524 |
| 15 | 10963084588 |
| 16 | 100087600184 |