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 | 3 |
| 3 | 8 |
| 4 | 24 |
| 5 | 77 |
| 6 | 256 |
| 7 | 874 |
| 8 | 3045 |
| 9 | 10780 |
| 10 | 38674 |
| 11 | 140268 |
| 12 | 513350 |
| 13 | 1892875 |
| 14 | 7023562 |
| 15 | 26200182 |
| 16 | 98182666 |
| 17 | 369393466 |
| 18 | 1394632365 |
| 19 | 5281753216 |
| 20 | 20058841004 |
| 21 | 76370762838 |
| 22 | 291436246116 |
| 23 | 1114474774102 |
| 24 | 4270050059100 |
| 25 | 16389518073023 |
| 26 | 63010289558056 |
| 27 | 242614318886286 |