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 | 2 |
| 4 | 7 |
| 5 | 22 |
| 6 | 82 |
| 7 | 308 |
| 8 | 1225 |
| 9 | 4954 |
| 10 | 20558 |
| 11 | 86572 |
| 12 | 369942 |
| 13 | 1598172 |
| 14 | 6972100 |
| 15 | 30663656 |
| 16 | 135826627 |
| 17 | 605386062 |
| 18 | 2713066882 |
| 19 | 12217967284 |
| 20 | 55262144418 |
| 21 | 250932354484 |
| 22 | 1143468874748 |
| 23 | 5227460728344 |
| 24 | 23968152050930 |
| 25 | 110191808568852 |
| 26 | 507857114699628 |