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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 5 |
| 9 | 9 |
| 10 | 15 |
| 11 | 31 |
| 12 | 70 |
| 13 | 146 |
| 14 | 300 |
| 15 | 656 |
| 16 | 1471 |
| 17 | 3258 |
| 18 | 7245 |
| 19 | 16400 |
| 20 | 37461 |
| 21 | 85773 |
| 22 | 197365 |
| 23 | 457297 |
| 24 | 1065070 |
| 25 | 2489750 |
| 26 | 5842741 |
| 27 | 13766775 |
| 28 | 32552087 |
| 29 | 77208432 |
| 30 | 183670145 |
| 31 | 438176307 |
| 32 | 1048092760 |
| 33 | 2513081101 |