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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 4 |
| 8 | 36 |
| 9 | 73 |
| 10 | 258 |
| 11 | 501 |
| 12 | 999 |
| 13 | 1383 |
| 14 | 4835 |
| 15 | 4685 |
| 16 | 10576 |
| 17 | 8497 |
| 18 | 42156 |
| 19 | 12931 |
| 20 | 129325 |
| 21 | 84555 |