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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 6 |
| 8 | 12 |
| 9 | 24 |
| 10 | 42 |
| 11 | 84 |
| 12 | 168 |
| 13 | 312 |
| 14 | 624 |
| 15 | 1248 |
| 16 | 2388 |
| 17 | 4776 |
| 18 | 9552 |
| 19 | 18576 |
| 20 | 37152 |
| 21 | 74304 |
| 22 | 145884 |
| 23 | 291768 |
| 24 | 583536 |
| 25 | 1152456 |
| 26 | 2304912 |
| 27 | 4609824 |
| 28 | 9138888 |
| 29 | 18277776 |
| 30 | 36555552 |
| 31 | 72654552 |
| 32 | 145309104 |
| 33 | 290618208 |
| 34 | 578607912 |