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 | 1 |
| 2 | 12 |
| 3 | 351 |
| 4 | 29160 |
| 5 | 7144929 |
| 6 | 5223002148 |
| 7 | 11433166050879 |
| 8 | 75035879252272080 |
| 9 | 1477081305957768349761 |
| 10 | 87223128348206814118735932 |
| 11 | 15451489966710801620870785316511 |
| 12 | 8211586182553137756809552940033725880 |
| 13 | 13091937140529934508508023103481190655434529 |