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) |
|---|---|
| 4 | 0 |
| 5 | 0 |
| 6 | 4 |
| 7 | 14 |
| 8 | 37 |
| 9 | 110 |
| 10 | 324 |
| 11 | 888 |
| 12 | 2368 |
| 13 | 6336 |
| 14 | 16874 |
| 15 | 44414 |
| 16 | 116181 |
| 17 | 303362 |
| 18 | 790157 |
| 19 | 2051880 |
| 20 | 5317599 |
| 21 | 13764133 |
| 22 | 35586766 |
| 23 | 91910082 |
| 24 | 237183164 |
| 25 | 611701614 |
| 26 | 1576773162 |
| 27 | 4062606255 |
| 28 | 10463699696 |
| 29 | 26942811809 |
| 30 | 69358469092 |