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) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 1705 |
| 3 | 47789 |
| 4 | 1369377 |
| 5 | 213162301 |
| 6 | 43005554527 |
| 7 | 14505995375 |
| 8 | 23869750002797 |
| 9 | 2384790127843063 |
| 10 | 624724994927411 |
| 11 | 24386251366041479501 |
| 12 | 2042595777439018142725 |
| 13 | 11191251831905709132993 |