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 | 9 |
| 2 | 14849 |
| 3 | 1020000 |
| 4 | 48718765 |
| 5 | 2176455745 |
| 6 | 96888186864 |
| 7 | 4398044676096 |
| 8 | 205891128374562 |
| 9 | 9999999993000000 |
| 10 | 505447028486892844 |
| 11 | 26623333280864342016 |
| 12 | 1461920290375412323014 |
| 13 | 83668255425284748853824 |