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 | 8 |
| 1 | 22 |
| 2 | 64 |
| 3 | 190 |
| 4 | 568 |
| 5 | 1702 |
| 6 | 5104 |
| 7 | 15310 |
| 8 | 45928 |
| 9 | 137782 |
| 10 | 413344 |
| 11 | 1240030 |
| 12 | 3720088 |
| 13 | 11160262 |
| 14 | 33480784 |
| 15 | 100442350 |
| 16 | 301327048 |
| 17 | 903981142 |
| 18 | 2711943424 |
| 19 | 8135830270 |
| 20 | 24407490808 |
| 21 | 73222472422 |
| 22 | 219667417264 |
| 23 | 659002251790 |
| 24 | 1977006755368 |
| 25 | 5931020266102 |
| 26 | 17793060798304 |
| 27 | 53379182394910 |