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 | 6 |
| 1 | 9 |
| 2 | 17 |
| 3 | 39 |
| 4 | 101 |
| 5 | 279 |
| 6 | 797 |
| 7 | 2319 |
| 8 | 6821 |
| 9 | 20199 |
| 10 | 60077 |
| 11 | 179199 |
| 12 | 535541 |
| 13 | 1602519 |
| 14 | 4799357 |
| 15 | 14381679 |
| 16 | 43112261 |
| 17 | 129271239 |
| 18 | 387682637 |
| 19 | 1162785759 |
| 20 | 3487832981 |
| 21 | 10462450359 |
| 22 | 31385253917 |
| 23 | 94151567439 |
| 24 | 282446313701 |
| 25 | 847322163879 |
| 26 | 2541932937197 |
| 27 | 7625731702719 |