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) |
|---|---|
| 4 | 3 |
| 5 | 0 |
| 6 | 0 |
| 7 | 14 |
| 8 | 104 |
| 9 | 146 |
| 10 | 773 |
| 11 | 2698 |
| 12 | 14350 |
| 13 | 32296 |
| 14 | 161714 |
| 15 | 460022 |
| 16 | 2159794 |
| 17 | 5851548 |
| 18 | 26468357 |
| 19 | 76442996 |
| 20 | 330719293 |
| 21 | 965759972 |
| 22 | 4056479056 |
| 23 | 12186078360 |
| 24 | 49668414086 |
| 25 | 151760518296 |
| 26 | 604396415979 |
| 27 | 1879966906486 |
| 28 | 7330203447133 |
| 29 | 23126786408904 |
| 30 | 88609897281582 |