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 | 0 |
| 2 | 23 |
| 3 | 1643 |
| 4 | 77194 |
| 5 | 2877651 |
| 6 | 90647411 |
| 7 | 2479201432 |
| 8 | 59893592245 |
| 9 | 1295484202258 |
| 10 | 25372355562592 |
| 11 | 454245432823858 |
| 12 | 7493960729135396 |