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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 17 |
| 6 | 39 |
| 7 | 191 |
| 8 | 410 |
| 9 | 1771 |
| 10 | 13805 |
| 11 | 26459 |
| 12 | 170897 |
| 13 | 556698 |
| 14 | 988053 |
| 15 | 3019206 |
| 16 | 15074481 |
| 17 | 70202708 |
| 18 | 115639004 |
| 19 | 498047289 |
| 20 | 1281427052 |
| 21 | 2039282754 |
| 22 | 7981334946 |
| 23 | 19374343049 |
| 24 | 71015123687 |
| 25 | 380553620426 |
| 26 | 862797574415 |
| 27 | 1292837481584 |
| 28 | 2875949125749 |
| 29 | 4270259833946 |
| 30 | 9334145396729 |