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 | 20 |
| 2 | 400 |
| 3 | 8702 |
| 4 | 188473 |
| 5 | 4505624 |
| 6 | 106770421 |
| 7 | 2770746488 |
| 8 | 71151220765 |
| 9 | 1969755500063 |