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 | 6 |
| 2 | 18 |
| 3 | 48 |
| 4 | 126 |
| 5 | 330 |
| 6 | 864 |
| 7 | 2262 |
| 8 | 5922 |
| 9 | 15504 |
| 10 | 40590 |
| 11 | 106266 |
| 12 | 278208 |
| 13 | 728358 |
| 14 | 1906866 |
| 15 | 4992240 |
| 16 | 13069854 |
| 17 | 34217322 |
| 18 | 89582112 |
| 19 | 234529014 |
| 20 | 614004930 |
| 21 | 1607485776 |
| 22 | 4208452398 |
| 23 | 11017871418 |
| 24 | 28845161856 |
| 25 | 75517614150 |
| 26 | 197707680594 |