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 | 13 |
| 2 | 79 |
| 3 | 475 |
| 4 | 2851 |
| 5 | 17107 |
| 6 | 102643 |
| 7 | 615859 |
| 8 | 3695155 |
| 9 | 22170931 |
| 10 | 133025587 |
| 11 | 798153523 |
| 12 | 4788921139 |
| 13 | 28733526835 |
| 14 | 172401161011 |
| 15 | 1034406966067 |
| 16 | 6206441796403 |
| 17 | 37238650778419 |
| 18 | 223431904670515 |
| 19 | 1340591428023091 |
| 20 | 8043548568138547 |