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 | 7 |
| 2 | 19 |
| 3 | 127 |
| 4 | 1657 |
| 5 | 10267 |
| 6 | 102121 |
| 7 | 1021417 |
| 8 | 10052191 |
| 9 | 100381321 |
| 10 | 1000556719 |
| 11 | 10000510297 |
| 12 | 100025541019 |
| 13 | 1000011191887 |
| 14 | 10000028937841 |
| 15 | 100000062634561 |
| 16 | 1000001305386991 |
| 17 | 10000001240507791 |
| 18 | 100000021541868691 |
| 19 | 1000000084213608427 |
| 20 | 10000000012591553221 |
| 21 | 100000000159478313337 |