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 | 3 |
| 1 | 5 |
| 2 | 31 |
| 3 | 197 |
| 4 | 1123 |
| 5 | 6485 |
| 6 | 37567 |
| 7 | 217397 |
| 8 | 1258051 |
| 9 | 7280549 |
| 10 | 42133471 |
| 11 | 243831461 |
| 12 | 1411082659 |
| 13 | 8166108917 |
| 14 | 47258275711 |
| 15 | 273489449237 |
| 16 | 1582717053571 |
| 17 | 9159378096965 |
| 18 | 53006446688671 |
| 19 | 306754821216389 |
| 20 | 1775227849020643 |