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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 12 |
| 6 | 34 |
| 7 | 111 |
| 8 | 315 |
| 9 | 933 |
| 10 | 2622 |
| 11 | 7503 |
| 12 | 21033 |
| 13 | 59472 |
| 14 | 167118 |
| 15 | 472120 |
| 16 | 1332945 |
| 17 | 3777600 |
| 18 | 10720869 |
| 19 | 30516447 |
| 20 | 87032994 |
| 21 | 248820704 |
| 22 | 712743768 |
| 23 | 2045784183 |
| 24 | 5882367570 |
| 25 | 16942974048 |
| 26 | 48876558318 |
| 27 | 141204944529 |
| 28 | 408494941773 |
| 29 | 1183247473872 |
| 30 | 3431450670601 |