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) |
|---|---|
| 2 | 28 |
| 3 | 104 |
| 4 | 388 |
| 5 | 1448 |
| 6 | 5404 |
| 7 | 20168 |
| 8 | 75268 |
| 9 | 280904 |
| 10 | 1048348 |
| 11 | 3912488 |
| 12 | 14601604 |
| 13 | 54493928 |
| 14 | 203374108 |
| 15 | 759002504 |
| 16 | 2832635908 |
| 17 | 10571541128 |
| 18 | 39453528604 |
| 19 | 147242573288 |
| 20 | 549516764548 |
| 21 | 2050824484904 |
| 22 | 7653781175068 |
| 23 | 28564300215368 |
| 24 | 106603419686404 |
| 25 | 397849378530248 |