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 | 0 |
| 1 | 2 |
| 2 | 2 |
| 3 | 12 |
| 4 | 22 |
| 5 | 92 |
| 6 | 222 |
| 7 | 772 |
| 8 | 2102 |
| 9 | 6732 |
| 10 | 19342 |
| 11 | 59732 |
| 12 | 175782 |
| 13 | 534172 |
| 14 | 1588862 |
| 15 | 4793892 |
| 16 | 14327062 |
| 17 | 43090412 |
| 18 | 129052782 |
| 19 | 387595252 |
| 20 | 1161911942 |
| 21 | 3487483452 |
| 22 | 10458955102 |
| 23 | 31383855812 |
| 24 | 94137586422 |
| 25 | 282440721292 |
| 26 | 847266239822 |