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 | 9 |
| 3 | 27 |
| 4 | 54 |
| 5 | 135 |
| 6 | 297 |
| 7 | 702 |
| 8 | 1593 |
| 9 | 3699 |
| 10 | 8478 |
| 11 | 19575 |
| 12 | 45009 |
| 13 | 103734 |
| 14 | 238761 |
| 15 | 549963 |
| 16 | 1266246 |
| 17 | 2916135 |
| 18 | 6714873 |
| 19 | 15463278 |
| 20 | 35607897 |
| 21 | 81997731 |
| 22 | 188821422 |
| 23 | 434814615 |
| 24 | 1001278881 |
| 25 | 2305722726 |
| 26 | 5309559369 |
| 27 | 12226727547 |
| 28 | 28155405654 |
| 29 | 64835588295 |
| 30 | 149301805257 |
| 31 | 343808570142 |