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 | 10 |
| 2 | 65 |
| 3 | 325 |
| 4 | 1371 |
| 5 | 5087 |
| 6 | 17080 |
| 7 | 52835 |
| 8 | 152606 |
| 9 | 415602 |
| 10 | 1075410 |
| 11 | 2660010 |
| 12 | 6320476 |
| 13 | 14485642 |
| 14 | 32131580 |
| 15 | 69181744 |
| 16 | 144943566 |
| 17 | 296136752 |
| 18 | 591142760 |
| 19 | 1154839554 |
| 20 | 2211164332 |
| 21 | 4154912452 |
| 22 | 7671082770 |
| 23 | 13930509344 |
| 24 | 24906380837 |
| 25 | 43880045952 |