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 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 54 |
| 7 | 472 |
| 8 | 27216 |
| 9 | 84738887 |
| 10 | 299164114847940 |
| 11 | 311903053042108587337426568 |
| 12 | 5846720173185251353387753850814872871131756204168 |