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 | 0 |
| 1 | 1 |
| 2 | 130 |
| 3 | 2319 |
| 4 | 18962 |
| 5 | 99407 |
| 6 | 400620 |
| 7 | 1323441 |
| 8 | 3835406 |
| 9 | 9924912 |
| 10 | 23736846 |
| 11 | 52729348 |
| 12 | 111173790 |
| 13 | 222415631 |
| 14 | 428578374 |
| 15 | 794363760 |
| 16 | 1430855958 |
| 17 | 2500747293 |
| 18 | 4274146464 |
| 19 | 7130355736 |
| 20 | 11681752260 |
| 21 | 18764913468 |
| 22 | 29690460150 |
| 23 | 46211761397 |
| 24 | 71016916110 |
| 25 | 107622522692 |