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 | 3 |
| 4 | 8 |
| 5 | 24 |
| 6 | 48 |
| 7 | 120 |
| 8 | 360 |
| 9 | 1088 |
| 10 | 3135 |
| 11 | 9999 |
| 12 | 31328 |
| 13 | 103040 |
| 14 | 342224 |
| 15 | 1151328 |
| 16 | 3920399 |
| 17 | 13571855 |
| 18 | 47416995 |
| 19 | 166642280 |
| 20 | 590733024 |
| 21 | 2105524995 |
| 22 | 7553695743 |
| 23 | 27244473480 |
| 24 | 98709700760 |
| 25 | 359212031648 |
| 26 | 1312529961648 |