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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 35 |
| 3 | 163 |
| 4 | 688 |
| 5 | 2673 |
| 6 | 9763 |
| 7 | 33792 |
| 8 | 111155 |
| 9 | 349122 |
| 10 | 1053323 |
| 11 | 3070003 |
| 12 | 8681103 |
| 13 | 23885604 |
| 14 | 64075075 |
| 15 | 167836570 |
| 16 | 429817326 |
| 17 | 1077457554 |
| 18 | 2646942189 |
| 19 | 6379963205 |
| 20 | 15104418023 |
| 21 | 35160248084 |
| 22 | 80550746390 |
| 23 | 181768697529 |