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 | 1 |
| 2 | 3 |
| 3 | 3 |
| 4 | 15 |
| 5 | 15 |
| 6 | 45 |
| 7 | 45 |
| 8 | 255 |
| 9 | 255 |
| 10 | 765 |
| 11 | 765 |
| 12 | 3825 |
| 13 | 3825 |
| 14 | 11475 |
| 15 | 11475 |
| 16 | 65535 |
| 17 | 65535 |
| 18 | 196605 |
| 19 | 196605 |
| 20 | 983025 |
| 21 | 983025 |
| 22 | 2949075 |
| 23 | 2949075 |
| 24 | 16711425 |
| 25 | 16711425 |
| 26 | 50134275 |
| 27 | 50134275 |
| 28 | 250671375 |
| 29 | 250671375 |
| 30 | 752014125 |
| 31 | 752014125 |
| 32 | 4294967295 |
| 33 | 4294967295 |