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) |
|---|---|
| 3 | 3 |
| 4 | 8 |
| 5 | 26 |
| 6 | 108 |
| 7 | 554 |
| 8 | 3392 |
| 9 | 24138 |
| 10 | 195716 |
| 11 | 1781018 |
| 12 | 17974584 |
| 13 | 199254842 |
| 14 | 2406840668 |
| 15 | 31466482506 |
| 16 | 442700857328 |
| 17 | 6669158209514 |
| 18 | 107112774491892 |
| 19 | 1827078520647098 |