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 | 33 |
| 2 | 129 |
| 3 | 417 |
| 4 | 1281 |
| 5 | 3873 |
| 6 | 11649 |
| 7 | 34977 |
| 8 | 104961 |
| 9 | 314913 |
| 10 | 944769 |
| 11 | 2834337 |
| 12 | 8503041 |
| 13 | 25509153 |
| 14 | 76527489 |
| 15 | 229582497 |
| 16 | 688747521 |
| 17 | 2066242593 |
| 18 | 6198727809 |
| 19 | 18596183457 |
| 20 | 55788550401 |
| 21 | 167365651233 |
| 22 | 502096953729 |
| 23 | 1506290861217 |
| 24 | 4518872583681 |
| 25 | 13556617751073 |
| 26 | 40669853253249 |