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 | 27 |
| 9 | 104 |
| 10 | 369 |
| 11 | 1236 |
| 12 | 3989 |
| 13 | 12522 |
| 14 | 38535 |
| 15 | 116808 |
| 16 | 350064 |
| 17 | 1039896 |
| 18 | 3068145 |
| 19 | 9004182 |
| 20 | 26314773 |
| 21 | 76652582 |
| 22 | 222705603 |
| 23 | 645731148 |
| 24 | 1869303857 |
| 25 | 5404655358 |
| 26 | 15611296146 |
| 27 | 45060069406 |
| 28 | 129989169909 |
| 29 | 374843799786 |
| 30 | 1080624405287 |