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 | 8 |
| 3 | 23 |
| 4 | 65 |
| 5 | 186 |
| 6 | 529 |
| 7 | 1504 |
| 8 | 4278 |
| 9 | 12167 |
| 10 | 34601 |
| 11 | 98401 |
| 12 | 279841 |
| 13 | 795830 |
| 14 | 2263236 |
| 15 | 6436343 |
| 16 | 18304103 |
| 17 | 52054435 |
| 18 | 148035889 |
| 19 | 420994376 |
| 20 | 1197252006 |
| 21 | 3404825447 |
| 22 | 9682870660 |
| 23 | 27536796142 |
| 24 | 78310985281 |
| 25 | 222706025200 |
| 26 | 633346311281 |
| 27 | 1801152661463 |
| 28 | 5122238579606 |