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 | 10 |
| 5 | 81 |
| 6 | 6484 |
| 7 | 47045881 |
| 8 | 1976694790777935 |
| 9 | 3907322295888616316743319752489 |
| 10 | 15267167523948202758593639172195435028185363247308211354852816 |