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 | 2 |
| 3 | 8 |
| 4 | 29 |
| 5 | 105 |
| 6 | 417 |
| 7 | 1719 |
| 8 | 7181 |
| 9 | 30603 |
| 10 | 132736 |
| 11 | 582790 |
| 12 | 2585352 |
| 13 | 11575613 |
| 14 | 52237278 |
| 15 | 237328704 |
| 16 | 1084701387 |
| 17 | 4983867447 |
| 18 | 23007263941 |
| 19 | 106658256768 |
| 20 | 496336303014 |
| 21 | 2317687534865 |
| 22 | 10856677523580 |
| 23 | 51001805706435 |
| 24 | 240225121539000 |
| 25 | 1134240896062656 |
| 26 | 5367428039668751 |