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 | 3 |
| 4 | 13 |
| 5 | 50 |
| 6 | 205 |
| 7 | 833 |
| 8 | 3437 |
| 9 | 14232 |
| 10 | 59301 |
| 11 | 248050 |
| 12 | 1041469 |
| 13 | 4385888 |
| 14 | 18519306 |
| 15 | 78376403 |
| 16 | 332370925 |
| 17 | 1412000824 |
| 18 | 6008104249 |
| 19 | 25601113893 |
| 20 | 109229104313 |
| 21 | 466577280830 |
| 22 | 1995120743749 |
| 23 | 8539562784258 |
| 24 | 36583756253885 |
| 25 | 156854365793800 |
| 26 | 673028595199000 |
| 27 | 2889847430222961 |
| 28 | 12416501973954798 |
| 29 | 53381063233213198 |