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) |
|---|---|
| 2 | 1 |
| 3 | 12 |
| 4 | 99 |
| 5 | 700 |
| 6 | 4569 |
| 7 | 28476 |
| 8 | 172508 |
| 9 | 1026288 |
| 10 | 6033690 |
| 11 | 35195512 |
| 12 | 204232809 |
| 13 | 1181052756 |
| 14 | 6814746393 |
| 15 | 39267916380 |
| 16 | 226097749224 |
| 17 | 1301403695520 |
| 18 | 7490649175326 |
| 19 | 43123589230824 |
| 20 | 248351880642630 |
| 21 | 1430956006648056 |
| 22 | 8249467230853002 |
| 23 | 47587180659332248 |