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 | 5 |
| 2 | 495 |
| 3 | 48510 |
| 4 | 4753490 |
| 5 | 465793515 |
| 6 | 45643010985 |
| 7 | 4472549283020 |
| 8 | 438264186724980 |
| 9 | 42945417749765025 |
| 10 | 4208212675290247475 |
| 11 | 412361896760694487530 |
| 12 | 40407257669872769530470 |
| 13 | 3959498889750770719498535 |
| 14 | 387990483937905657741325965 |
| 15 | 38019107927025003687930446040 |