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 | 3 |
| 2 | 17 |
| 3 | 169 |
| 4 | 2853 |
| 5 | 80573 |
| 6 | 3778867 |
| 7 | 293207907 |
| 8 | 37563586269 |
| 9 | 7937469117891 |
| 10 | 2764964877941141 |
| 11 | 1587376056676684453 |
| 12 | 1501785457780559131093 |
| 13 | 2341332949071519298798233 |