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 | 1 |
| 2 | 21 |
| 3 | 2403 |
| 4 | 1500183 |
| 5 | 5110723191 |
| 6 | 95013316876491 |
| 7 | 9639473169171326643 |
| 8 | 5336900216006709884938623 |
| 9 | 16124704040675904181778734982451 |
| 10 | 265865038636937159336134567410478299051 |