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 | 239 |
| 3 | 15066 |
| 4 | 449677 |
| 5 | 9317846 |
| 6 | 154090507 |
| 7 | 2167109763 |
| 8 | 26799758534 |
| 9 | 297417275848 |
| 10 | 3004658410735 |
| 11 | 27940725989130 |
| 12 | 241350612592135 |
| 13 | 1951440294582041 |
| 14 | 14865802497447044 |
| 15 | 107290958051308517 |