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 | 10 |
| 2 | 31 |
| 3 | 94 |
| 4 | 283 |
| 5 | 850 |
| 6 | 2551 |
| 7 | 7654 |
| 8 | 22963 |
| 9 | 68890 |
| 10 | 206671 |
| 11 | 620014 |
| 12 | 1860043 |
| 13 | 5580130 |
| 14 | 16740391 |
| 15 | 50221174 |
| 16 | 150663523 |
| 17 | 451990570 |
| 18 | 1355971711 |
| 19 | 4067915134 |
| 20 | 12203745403 |
| 21 | 36611236210 |
| 22 | 109833708631 |
| 23 | 329501125894 |
| 24 | 988503377683 |
| 25 | 2965510133050 |
| 26 | 8896530399151 |