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 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 26 |
| 4 | 66 |
| 5 | 154 |
| 6 | 346 |
| 7 | 771 |
| 8 | 1726 |
| 9 | 3887 |
| 10 | 8768 |
| 11 | 19700 |
| 12 | 43890 |
| 13 | 96717 |
| 14 | 210665 |
| 15 | 453893 |
| 16 | 968903 |
| 17 | 2053260 |
| 18 | 4328489 |
| 19 | 9093971 |
| 20 | 19068611 |
| 21 | 39943689 |
| 22 | 83628399 |
| 23 | 175018523 |
| 24 | 366081209 |
| 25 | 765102907 |
| 26 | 1597315656 |
| 27 | 3330380593 |
| 28 | 6933810145 |