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 | 3 |
| 5 | 9 |
| 6 | 73 |
| 7 | 230 |
| 8 | 1335 |
| 9 | 4376 |
| 10 | 22144 |
| 11 | 74766 |
| 12 | 351558 |
| 13 | 1213965 |
| 14 | 5458347 |
| 15 | 19181130 |
| 16 | 83735127 |
| 17 | 298391598 |
| 18 | 1276135088 |
| 19 | 4599546922 |
| 20 | 19380537318 |
| 21 | 70514368558 |
| 22 | 293838981413 |
| 23 | 1077617352348 |
| 24 | 4452600188602 |
| 25 | 16440039884624 |
| 26 | 67481063581593 |
| 27 | 250610375841434 |
| 28 | 1023303550651792 |