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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 9 |
| 6 | 40 |
| 7 | 169 |
| 8 | 477 |
| 9 | 1099 |
| 10 | 8766 |
| 11 | 56341 |
| 12 | 234717 |
| 13 | 774279 |
| 14 | 2182270 |
| 15 | 27260478 |
| 16 | 249339033 |
| 17 | 1457282467 |
| 18 | 6624389780 |
| 19 | 25274016620 |
| 20 | 84400336507 |
| 21 | 1518975557185 |
| 22 | 18799199683021 |
| 23 | 147690564521818 |
| 24 | 892559422156897 |
| 25 | 4474464873070564 |
| 26 | 19410417198316364 |