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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 43 |
| 4 | 27 |
| 5 | 719 |
| 6 | 3661 |
| 7 | 13991 |
| 8 | 66769 |
| 9 | 133261 |
| 10 | 2363513 |
| 11 | 116441047 |
| 12 | 513267739 |
| 13 | 153434147 |
| 14 | 96790969339 |
| 15 | 2053217625931 |
| 16 | 136839921293 |
| 17 | 67725860135459 |
| 18 | 837687671342383 |
| 19 | 7232743280136193 |
| 20 | 2996031500521181 |
| 21 | 4142815387557270467 |