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 | 2 |
| 1 | 11 |
| 2 | 61 |
| 3 | 341 |
| 4 | 1921 |
| 5 | 10901 |
| 6 | 62281 |
| 7 | 358061 |
| 8 | 2070241 |
| 9 | 12030821 |
| 10 | 70231801 |
| 11 | 411625181 |
| 12 | 2420922961 |
| 13 | 14281397141 |
| 14 | 84467679721 |
| 15 | 500702562701 |
| 16 | 2973697798081 |
| 17 | 17689598897861 |
| 18 | 105374653934041 |
| 19 | 628433226338621 |