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 | 9 |
| 4 | 70 |
| 5 | 771 |
| 6 | 10948 |
| 7 | 190205 |
| 8 | 3907494 |
| 9 | 92654059 |
| 10 | 2490459468 |
| 11 | 74827519077 |
| 12 | 2485153213814 |
| 13 | 90403692195179 |
| 14 | 3574835773247140 |
| 15 | 152675377606343901 |
| 16 | 7003761877546096278 |
| 17 | 343454890456254782203 |
| 18 | 17929588055863943650988 |