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 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 8 |
| 9 | 23 |
| 10 | 61 |
| 11 | 167 |
| 12 | 461 |
| 13 | 1288 |
| 14 | 3593 |
| 15 | 10084 |
| 16 | 28381 |
| 17 | 80218 |
| 18 | 227156 |
| 19 | 644864 |
| 20 | 1834290 |
| 21 | 5227297 |
| 22 | 14919502 |
| 23 | 42644478 |
| 24 | 122047963 |
| 25 | 349716506 |
| 26 | 1003120145 |
| 27 | 2880163515 |
| 28 | 8276937322 |
| 29 | 23805829084 |
| 30 | 68521035251 |
| 31 | 197365718477 |
| 32 | 568859465838 |
| 33 | 1640609651599 |
| 34 | 4734261078026 |