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) |
|---|---|
| 3 | 3 |
| 4 | 12 |
| 5 | 54 |
| 6 | 198 |
| 7 | 729 |
| 8 | 2538 |
| 9 | 8748 |
| 10 | 29484 |
| 11 | 98415 |
| 12 | 324648 |
| 13 | 1062882 |
| 14 | 3454002 |
| 15 | 11160261 |
| 16 | 35871174 |
| 17 | 114791256 |
| 18 | 365893848 |
| 19 | 1162261467 |
| 20 | 3680484804 |
| 21 | 11622614670 |
| 22 | 36611206686 |
| 23 | 115063885233 |
| 24 | 360882096930 |
| 25 | 1129718145924 |
| 26 | 3530368940292 |