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) |
|---|---|
| 8 | 1 |
| 9 | 8 |
| 10 | 71 |
| 11 | 461 |
| 12 | 2706 |
| 13 | 14235 |
| 14 | 70161 |
| 15 | 327469 |
| 16 | 1469596 |
| 17 | 6389144 |
| 18 | 27097948 |
| 19 | 112630404 |
| 20 | 460511702 |
| 21 | 1857372265 |
| 22 | 7406424903 |
| 23 | 29250500171 |
| 24 | 114576069911 |
| 25 | 445647539540 |
| 26 | 1722814022086 |
| 27 | 6624828067482 |
| 28 | 25356181172529 |
| 29 | 96650473757117 |
| 30 | 367059233827762 |
| 31 | 1389476976680608 |