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 | 3 |
| 3 | 9 |
| 4 | 9 |
| 5 | 50 |
| 6 | 50 |
| 7 | 204 |
| 8 | 204 |
| 9 | 1135 |
| 10 | 1135 |
| 11 | 6086 |
| 12 | 6086 |
| 13 | 36018 |
| 14 | 36018 |
| 15 | 216932 |
| 16 | 216932 |
| 17 | 1306070 |
| 18 | 1306070 |
| 19 | 8129138 |
| 20 | 8129138 |
| 21 | 51773946 |
| 22 | 51773946 |
| 23 | 326701423 |
| 24 | 326701423 |