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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 30 |
| 5 | 73 |
| 6 | 185 |
| 7 | 467 |
| 8 | 1207 |
| 9 | 3147 |
| 10 | 8329 |
| 11 | 22245 |
| 12 | 60071 |
| 13 | 163462 |
| 14 | 448277 |
| 15 | 1236913 |
| 16 | 3432327 |
| 17 | 9569352 |
| 18 | 26792706 |
| 19 | 75288346 |
| 20 | 212249873 |
| 21 | 600069431 |
| 22 | 1700826842 |
| 23 | 4831722294 |
| 24 | 13754016792 |
| 25 | 39224295915 |
| 26 | 112048279650 |
| 27 | 320563736148 |
| 28 | 918388655873 |
| 29 | 2634460759783 |
| 30 | 7566000947867 |