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 | 3 |
| 2 | 1 |
| 3 | 9 |
| 4 | 15 |
| 5 | 6 |
| 6 | 27 |
| 7 | 108 |
| 8 | 135 |
| 9 | 42 |
| 10 | 81 |
| 11 | 594 |
| 12 | 1539 |
| 13 | 1530 |
| 14 | 456 |
| 15 | 243 |
| 16 | 2835 |
| 17 | 12555 |
| 18 | 25245 |
| 19 | 22122 |
| 20 | 6120 |
| 21 | 729 |
| 22 | 12393 |
| 23 | 83835 |
| 24 | 281475 |
| 25 | 482436 |
| 26 | 383292 |
| 27 | 101520 |
| 28 | 2187 |
| 29 | 51030 |
| 30 | 489888 |
| 31 | 2466450 |
| 32 | 6916833 |
| 33 | 10546200 |
| 34 | 7786692 |
| 35 | 1980720 |