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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 13 |
| 6 | 33 |
| 7 | 81 |
| 8 | 183 |
| 9 | 402 |
| 10 | 856 |
| 11 | 1801 |
| 12 | 3721 |
| 13 | 7646 |
| 14 | 15567 |
| 15 | 31575 |