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 | 5 |
| 2 | 23 |
| 3 | 45 |
| 4 | 925 |
| 5 | 7285 |
| 6 | 7195 |
| 7 | 641075 |
| 8 | 6993545 |
| 9 | 27779915 |
| 10 | 1077005935 |
| 11 | 15001154095 |
| 12 | 6788401045 |
| 13 | 3570274674605 |
| 14 | 60484653310955 |
| 15 | 40198648188145 |
| 16 | 1869525647793155 |
| 17 | 31559031031400605 |
| 18 | 2865359642850975565 |