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) |
|---|---|
| 6 | 1 |
| 7 | 6 |
| 8 | 41 |
| 9 | 209 |
| 10 | 1005 |
| 11 | 4411 |
| 12 | 18546 |
| 13 | 74854 |
| 14 | 294293 |
| 15 | 1131635 |
| 16 | 4280686 |
| 17 | 15974526 |
| 18 | 58974616 |
| 19 | 215772740 |
| 20 | 783598381 |
| 21 | 2827768273 |
| 22 | 10149744903 |
| 23 | 36261522803 |
| 24 | 129027358151 |
| 25 | 457486923079 |
| 26 | 1617031493924 |
| 27 | 5699720240694 |
| 28 | 20040736126691 |
| 29 | 70308818376855 |
| 30 | 246171461366950 |