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 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 22 |
| 7 | 59 |
| 8 | 141 |
| 9 | 299 |
| 10 | 632 |
| 11 | 1428 |
| 12 | 3354 |
| 13 | 7559 |
| 14 | 17051 |
| 15 | 39011 |
| 16 | 88596 |
| 17 | 199718 |
| 18 | 450804 |
| 19 | 1024183 |
| 20 | 2325465 |
| 21 | 5263935 |
| 22 | 11925661 |
| 23 | 27045401 |
| 24 | 61298900 |
| 25 | 138851955 |
| 26 | 314630019 |
| 27 | 713229703 |
| 28 | 1616454503 |
| 29 | 3662850431 |
| 30 | 8300898385 |
| 31 | 18813133993 |