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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 43 |
| 6 | 137 |
| 7 | 431 |
| 8 | 1433 |
| 9 | 4871 |
| 10 | 16811 |
| 11 | 58787 |
| 12 | 208037 |
| 13 | 742909 |
| 14 | 2674453 |
| 15 | 9694849 |
| 16 | 35357711 |
| 17 | 129644831 |
| 18 | 477638741 |
| 19 | 1767263209 |
| 20 | 6564120463 |
| 21 | 24466267027 |
| 22 | 91482563651 |
| 23 | 343059613667 |
| 24 | 1289904147349 |
| 25 | 4861946401453 |
| 26 | 18367353072191 |