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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 17 |
| 8 | 46 |
| 9 | 116 |
| 10 | 284 |
| 11 | 677 |
| 12 | 1595 |
| 13 | 3730 |
| 14 | 8610 |
| 15 | 19680 |
| 16 | 44580 |
| 17 | 100272 |
| 18 | 224144 |
| 19 | 498104 |
| 20 | 1101072 |
| 21 | 2422264 |
| 22 | 5305804 |
| 23 | 11576316 |
| 24 | 25165920 |
| 25 | 54526160 |
| 26 | 117776220 |
| 27 | 253671540 |
| 28 | 544924088 |
| 29 | 1167694512 |
| 30 | 2496450336 |
| 31 | 5325759912 |
| 32 | 11338713768 |
| 33 | 24094766848 |