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) |
|---|---|
| 3 | 1 |
| 4 | 259 |
| 5 | 57535 |
| 6 | 12485095 |
| 7 | 2698853335 |
| 8 | 583026951031 |
| 9 | 125936508182839 |
| 10 | 27202382491194295 |
| 11 | 5875718100153221815 |
| 12 | 1269155234987097152695 |
| 13 | 274137535269957102205111 |
| 14 | 59213707780769522731688119 |
| 15 | 12790160886494733304250601655 |