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 | 3 |
| 2 | 6 |
| 3 | 34 |
| 4 | 136 |
| 5 | 498 |
| 6 | 2082 |
| 7 | 8146 |
| 8 | 32946 |
| 9 | 131058 |
| 10 | 524232 |
| 11 | 2096928 |
| 12 | 8387712 |
| 13 | 33550848 |
| 14 | 134226562 |
| 15 | 536859906 |
| 16 | 2147439624 |
| 17 | 8589943858 |
| 18 | 34359775432 |
| 19 | 137439101728 |
| 20 | 549756406912 |
| 21 | 2199022661826 |
| 22 | 8796090647304 |
| 23 | 35184374452498 |
| 24 | 140737497809992 |
| 25 | 562949943786834 |
| 26 | 2251799775147336 |