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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 3 |
| 7 | 10 |
| 8 | 40 |
| 9 | 51 |
| 10 | 21 |
| 11 | 122 |
| 12 | 644 |
| 13 | 1236 |
| 14 | 1029 |
| 15 | 315 |
| 16 | 3346 |
| 17 | 21496 |
| 18 | 54060 |
| 19 | 66780 |
| 20 | 40635 |
| 21 | 9765 |
| 22 | 196082 |
| 23 | 1471460 |
| 24 | 4527228 |
| 25 | 7328580 |
| 26 | 6596100 |
| 27 | 3134565 |
| 28 | 615195 |