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 | 37 |
| 3 | 677 |
| 4 | 1601 |
| 5 | 8837 |
| 6 | 33857 |
| 7 | 122501 |
| 8 | 246017 |
| 9 | 11492101 |
| 10 | 12503297 |
| 11 | 2058436901 |
| 12 | 6844914757 |
| 13 | 9813676097 |
| 14 | 127566122897 |
| 15 | 707119537217 |
| 16 | 15058714869137 |
| 17 | 779243651884097 |
| 18 | 1641669426950401 |
| 19 | 10965274367622437 |
| 20 | 1269017804759665217 |
| 21 | 4346851918104880901 |