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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 5 |
| 8 | 10 |
| 9 | 19 |
| 10 | 42 |
| 11 | 92 |
| 12 | 225 |
| 13 | 564 |
| 14 | 1501 |
| 15 | 4127 |
| 16 | 11809 |
| 17 | 34713 |
| 18 | 104904 |
| 19 | 323778 |
| 20 | 1019538 |
| 21 | 3265502 |
| 22 | 10624881 |
| 23 | 35065697 |
| 24 | 117289911 |
| 25 | 397290416 |
| 26 | 1362060455 |
| 27 | 4724272231 |
| 28 | 16572501190 |
| 29 | 58782486855 |
| 30 | 210782826628 |
| 31 | 763991002957 |