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) |
|---|---|
| 6 | 1 |
| 7 | 13 |
| 8 | 106 |
| 9 | 615 |
| 10 | 2850 |
| 11 | 11087 |
| 12 | 37626 |
| 13 | 114177 |
| 14 | 315805 |
| 15 | 807520 |
| 16 | 1930600 |
| 17 | 4354140 |
| 18 | 9331560 |
| 19 | 19117980 |
| 20 | 37630440 |
| 21 | 71461368 |
| 22 | 131399829 |
| 23 | 234661713 |
| 24 | 408100330 |
| 25 | 692741335 |
| 26 | 1150092658 |
| 27 | 1870787919 |
| 28 | 2986277658 |
| 29 | 4684437485 |
| 30 | 7230182505 |