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 | 4 |
| 2 | 11 |
| 3 | 27 |
| 4 | 76 |
| 5 | 185 |
| 6 | 489 |
| 7 | 1204 |
| 8 | 3059 |
| 9 | 7539 |
| 10 | 18748 |
| 11 | 46001 |
| 12 | 112977 |
| 13 | 275620 |
| 14 | 671387 |
| 15 | 1629003 |
| 16 | 3944428 |
| 17 | 9524969 |
| 18 | 22955577 |
| 19 | 55208404 |
| 20 | 132545027 |
| 21 | 317673891 |
| 22 | 760222300 |
| 23 | 1816668257 |
| 24 | 4335499425 |
| 25 | 10333941316 |
| 26 | 24603369515 |
| 27 | 58513434747 |
| 28 | 139020574348 |