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 | 3 |
| 2 | 45 |
| 3 | 11475 |
| 4 | 752014125 |
| 5 | 3229876072253041875 |
| 6 | 59580697294650083747194059426068878125 |
| 7 | 20274260698223485458204828871028994444941136941453077244297515184669623921875 |