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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 7 |
| 10 | 24 |
| 11 | 80 |
| 12 | 216 |
| 13 | 648 |
| 14 | 1304 |
| 15 | 3392 |
| 16 | 13808 |
| 17 | 59448 |
| 18 | 155464 |
| 19 | 480728 |
| 20 | 1588162 |
| 21 | 5626309 |
| 22 | 28279112 |
| 23 | 157469880 |
| 24 | 842498189 |
| 25 | 4998554801 |
| 26 | 28466978744 |
| 27 | 166572523589 |
| 28 | 1020487969891 |
| 29 | 5753385660978 |