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 | 5 |
| 2 | 10045 |
| 3 | 20475 |
| 4 | 836640 |
| 5 | 12397000 |
| 6 | 1331330000 |
| 7 | 143820000 |
| 8 | 213051960000 |
| 9 | 94724270640000 |
| 10 | 3908675145375000 |
| 11 | 104284286367187500 |
| 12 | 43867845932728125000000 |
| 13 | 12399293137277921875000 |