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 | 1 |
| 7 | 3 |
| 8 | 12 |
| 9 | 59 |
| 10 | 313 |
| 11 | 1713 |
| 12 | 9559 |
| 13 | 54189 |
| 14 | 311460 |
| 15 | 1812281 |
| 16 | 10661303 |
| 17 | 63336873 |
| 18 | 379601353 |
| 19 | 2293205687 |
| 20 | 13953099573 |
| 21 | 85451824382 |
| 22 | 526431271347 |
| 23 | 3260689089300 |
| 24 | 20296848348929 |
| 25 | 126918850161182 |
| 26 | 796981464813540 |