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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 28 |
| 7 | 70 |
| 8 | 189 |
| 9 | 533 |
| 10 | 1551 |
| 11 | 4599 |
| 12 | 13807 |
| 13 | 41784 |
| 14 | 127144 |
| 15 | 388373 |
| 16 | 1189661 |
| 17 | 3651910 |
| 18 | 11228851 |
| 19 | 34571914 |
| 20 | 106555917 |
| 21 | 328713138 |
| 22 | 1014797705 |
| 23 | 3134841053 |
| 24 | 9689148780 |
| 25 | 29961083746 |
| 26 | 92683964271 |
| 27 | 286816872102 |
| 28 | 887849075464 |
| 29 | 2749110140301 |
| 30 | 8514323952447 |