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 | 0 |
| 2 | 1 |
| 3 | 15 |
| 4 | 4790 |
| 5 | 4151415 |
| 6 | 6619291247 |
| 7 | 17510518983528 |
| 8 | 71631394311300461 |
| 9 | 429426878302882412435 |
| 10 | 3616596939726424941979785 |