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 | 4 |
| 2 | 12 |
| 3 | 24 |
| 4 | 52 |
| 5 | 108 |
| 6 | 224 |
| 7 | 412 |
| 8 | 844 |
| 9 | 1528 |
| 10 | 3152 |
| 11 | 5036 |
| 12 | 11984 |
| 13 | 15040 |
| 14 | 46512 |
| 15 | 34788 |
| 16 | 197612 |
| 17 | 4036 |
| 18 | 929368 |
| 19 | -702592 |
| 20 | 4847552 |
| 21 | -7033956 |
| 22 | 27903296 |
| 23 | -54403996 |
| 24 | 170579740 |