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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 31 |
| 4 | 2419 |
| 5 | 176795035 |
| 6 | 883922739668546300971 |
| 7 | 1511516294872733607299090320742127160367108420362968907 |