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 | 6 |
| 3 | 9 |
| 4 | 30 |
| 5 | 54 |
| 6 | 27 |
| 7 | 222 |
| 8 | 468 |
| 9 | 324 |
| 10 | 81 |
| 11 | 2190 |
| 12 | 5130 |
| 13 | 4320 |
| 14 | 1620 |
| 15 | 243 |
| 16 | 27006 |
| 17 | 68400 |
| 18 | 65610 |
| 19 | 30780 |
| 20 | 7290 |
| 21 | 729 |
| 22 | 399630 |
| 23 | 1076166 |
| 24 | 1135890 |
| 25 | 618030 |
| 26 | 187110 |
| 27 | 30618 |
| 28 | 2187 |
| 29 | 6899262 |
| 30 | 19532268 |
| 31 | 22212792 |
| 32 | 13471920 |
| 33 | 4796820 |
| 34 | 1020600 |
| 35 | 122472 |
| 36 | 6561 |