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) |
|---|---|
| 3 | 1 |
| 4 | 37 |
| 5 | 376 |
| 6 | 2267 |
| 7 | 10220 |
| 8 | 38403 |
| 9 | 127921 |
| 10 | 392688 |
| 11 | 1140260 |
| 12 | 3189022 |
| 13 | 8699540 |
| 14 | 23352118 |
| 15 | 62048869 |
| 16 | 163843187 |
| 17 | 431026972 |
| 18 | 1131463777 |
| 19 | 2966502032 |
| 20 | 7772382641 |
| 21 | 20356549685 |
| 22 | 53305176134 |
| 23 | 139569431544 |
| 24 | 365416760764 |
| 25 | 956698453752 |
| 26 | 2504701077772 |
| 27 | 6557433205689 |
| 28 | 17167634170241 |