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) |
|---|---|
| 4 | 21 |
| 5 | 94 |
| 6 | 544 |
| 7 | 3509 |
| 8 | 26799 |
| 9 | 223123 |
| 10 | 2133511 |
| 11 | 21793042 |
| 12 | 248348572 |
| 13 | 3008632130 |
| 14 | 39989075942 |
| 15 | 558800689295 |