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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 24 |
| 7 | 66 |
| 8 | 132 |
| 9 | 264 |
| 10 | 792 |
| 11 | 1848 |
| 12 | 2772 |
| 13 | 5544 |
| 14 | 13332 |
| 15 | 14652 |
| 16 | 24024 |
| 17 | 26664 |
| 18 | 72072 |
| 19 | 79992 |
| 20 | 186648 |
| 21 | 205128 |
| 22 | 264264 |
| 23 | 559944 |
| 24 | 792792 |
| 25 | 1333332 |
| 26 | 2666664 |
| 27 | 7279272 |
| 28 | 7999992 |
| 29 | 13333320 |
| 30 | 14666652 |
| 31 | 26690664 |
| 32 | 29333304 |
| 33 | 80071992 |
| 34 | 134666532 |
| 35 | 269333064 |
| 36 | 807999192 |