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 | 1 |
| 2 | 70 |
| 3 | 34650 |
| 4 | 4635540 |
| 5 | 439192790 |
| 6 | 51023044582 |
| 7 | 5712786772130 |
| 8 | 590059992663400 |
| 9 | 59838424359107090 |