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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 6 |
| 7 | 15 |
| 8 | 33 |
| 9 | 82 |
| 10 | 194 |
| 11 | 482 |
| 12 | 1188 |
| 13 | 2988 |
| 14 | 7528 |
| 15 | 19181 |
| 16 | 49060 |
| 17 | 126369 |
| 18 | 326863 |
| 19 | 849650 |
| 20 | 2216862 |
| 21 | 5806256 |
| 22 | 15256265 |
| 23 | 40210657 |
| 24 | 106273050 |
| 25 | 281593237 |
| 26 | 747890675 |
| 27 | 1990689459 |
| 28 | 5309397294 |
| 29 | 14187485959 |
| 30 | 37977600390 |
| 31 | 101827024251 |