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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 151 |
| 5 | 757 |
| 6 | 14341 |
| 7 | 36563 |
| 8 | 1114111 |
| 9 | 1793971 |
| 10 | 7256527 |
| 11 | 115737511 |
| 12 | 188646881 |
| 13 | 746676647 |
| 14 | 11984748911 |
| 15 | 19541414591 |
| 16 | 75174747157 |
| 17 | 1192238322911 |
| 18 | 1901840481091 |
| 19 | 7382419142837 |
| 20 | 115344262443511 |
| 21 | 181836161638181 |