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 | 0 |
| 1 | 1 |
| 2 | 25 |
| 3 | 601 |
| 4 | 14425 |
| 5 | 346201 |
| 6 | 8308825 |
| 7 | 199411801 |
| 8 | 4785883225 |
| 9 | 114861197401 |
| 10 | 2756668737625 |
| 11 | 66160049703001 |
| 12 | 1587841192872025 |
| 13 | 38108188628928601 |
| 14 | 914596527094286425 |
| 15 | 21950316650262874201 |
| 16 | 526807599606308980825 |
| 17 | 12643382390551415539801 |
| 18 | 303441177373233972955225 |