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 | 11 |
| 3 | 29 |
| 4 | 83 |
| 5 | 245 |
| 6 | 731 |
| 7 | 2189 |
| 8 | 6563 |
| 9 | 19685 |
| 10 | 59051 |
| 11 | 177149 |
| 12 | 531443 |
| 13 | 1594325 |
| 14 | 4782971 |
| 15 | 14348909 |
| 16 | 43046723 |
| 17 | 129140165 |
| 18 | 387420491 |
| 19 | 1162261469 |
| 20 | 3486784403 |
| 21 | 10460353205 |
| 22 | 31381059611 |
| 23 | 94143178829 |
| 24 | 282429536483 |
| 25 | 847288609445 |