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 | 6 |
| 3 | 26 |
| 4 | 106 |
| 5 | 424 |
| 6 | 1684 |
| 7 | 6667 |
| 8 | 26352 |
| 9 | 104069 |
| 10 | 410806 |
| 11 | 1621325 |
| 12 | 6398688 |
| 13 | 25254823 |
| 14 | 99691822 |
| 15 | 393600358 |
| 16 | 1554333406 |
| 17 | 6139498384 |
| 18 | 24256359424 |
| 19 | 95857063972 |
| 20 | 378903471934 |
| 21 | 1498090689910 |
| 22 | 5924490920776 |
| 23 | 23435015022946 |
| 24 | 92721024432286 |