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 | 1 |
| 2 | 6 |
| 3 | 26 |
| 4 | 131 |
| 5 | 626 |
| 6 | 3156 |
| 7 | 15626 |
| 8 | 78256 |
| 9 | 390651 |
| 10 | 1953756 |
| 11 | 9765626 |
| 12 | 48831406 |
| 13 | 244140626 |
| 14 | 1220718756 |
| 15 | 6103516276 |
| 16 | 30517656381 |
| 17 | 152587890626 |
| 18 | 762939846906 |
| 19 | 3814697265626 |
| 20 | 19073488282006 |
| 21 | 95367431656276 |
| 22 | 476837167968756 |
| 23 | 2384185791015626 |
| 24 | 11920929003987656 |