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 | 7 |
| 2 | 117 |
| 3 | 2440 |
| 4 | 21880 |
| 5 | 48439 |
| 6 | 252499 |
| 7 | 8209165 |
| 8 | 55616210 |
| 9 | 45681781 |
| 10 | 386980412 |
| 11 | 32104158792 |
| 12 | 1221587715177 |
| 13 | 81111117323616 |