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 | 2 |
| 2 | 6 |
| 3 | 17 |
| 4 | 43 |
| 5 | 112 |
| 6 | 289 |
| 7 | 743 |
| 8 | 1910 |
| 9 | 4913 |
| 10 | 12632 |
| 11 | 32482 |
| 12 | 83521 |
| 13 | 214756 |
| 14 | 552198 |
| 15 | 1419857 |
| 16 | 3650852 |
| 17 | 9387368 |
| 18 | 24137569 |
| 19 | 62064486 |
| 20 | 159585272 |
| 21 | 410338673 |
| 22 | 1055096275 |
| 23 | 2712949630 |
| 24 | 6975757441 |
| 25 | 17936636688 |
| 26 | 46120143716 |
| 27 | 118587876497 |
| 28 | 304922823711 |
| 29 | 784042443182 |