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 | 5 |
| 1 | 7 |
| 2 | 13 |
| 3 | 31 |
| 4 | 85 |
| 5 | 247 |
| 6 | 733 |
| 7 | 2191 |
| 8 | 6565 |
| 9 | 19687 |
| 10 | 59053 |
| 11 | 177151 |
| 12 | 531445 |
| 13 | 1594327 |
| 14 | 4782973 |
| 15 | 14348911 |
| 16 | 43046725 |
| 17 | 129140167 |
| 18 | 387420493 |
| 19 | 1162261471 |
| 20 | 3486784405 |
| 21 | 10460353207 |
| 22 | 31381059613 |
| 23 | 94143178831 |
| 24 | 282429536485 |
| 25 | 847288609447 |