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 | 2 |
| 7 | 4 |
| 8 | 8 |
| 9 | 16 |
| 10 | 32 |
| 11 | 96 |
| 12 | 288 |
| 13 | 864 |
| 14 | 2592 |
| 15 | 7776 |
| 16 | 31104 |
| 17 | 124416 |
| 18 | 497664 |
| 19 | 1990656 |
| 20 | 7962624 |
| 21 | 39813120 |
| 22 | 199065600 |
| 23 | 995328000 |
| 24 | 4976640000 |
| 25 | 24883200000 |
| 26 | 149299200000 |
| 27 | 895795200000 |
| 28 | 5374771200000 |
| 29 | 32248627200000 |
| 30 | 193491763200000 |
| 31 | 1354442342400000 |