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) |
|---|---|
| 5 | 1 |
| 6 | 9 |
| 7 | 55 |
| 8 | 286 |
| 9 | 1362 |
| 10 | 6143 |
| 11 | 26729 |
| 12 | 113471 |
| 13 | 473471 |
| 14 | 1951612 |
| 15 | 7974660 |
| 16 | 32384127 |
| 17 | 130926391 |
| 18 | 527657073 |
| 19 | 2121795391 |
| 20 | 8518575466 |
| 21 | 34162154550 |
| 22 | 136893468863 |
| 23 | 548253828965 |
| 24 | 2194897467395 |
| 25 | 8784784672511 |
| 26 | 35153438973304 |
| 27 | 140653028240520 |
| 28 | 562719731644671 |