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 | 4 |
| 3 | 131 |
| 4 | 14118 |
| 5 | 2976853 |
| 6 | 1013582110 |
| 7 | 508233789579 |
| 8 | 352755124921122 |
| 9 | 324039613564554401 |
| 10 | 380751174738424280720 |
| 11 | 557175918657122229139987 |
| 12 | 993806827312044893602464496 |