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 | 5 |
| 3 | 75025 |
| 4 | 514229 |
| 5 | 165580141 |
| 6 | 7778742049 |
| 7 | 2504730781961 |
| 8 | 17167680177565 |
| 9 | 259695496911122585 |
| 10 | 1779979416004714189 |
| 11 | 573147844013817084101 |
| 12 | 59425114757512643212875125 |
| 13 | 898923707008479989274290850145 |