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 | 13 |
| 2 | 81 |
| 3 | 477 |
| 4 | 2785 |
| 5 | 16237 |
| 6 | 94641 |
| 7 | 551613 |
| 8 | 3215041 |
| 9 | 18738637 |
| 10 | 109216785 |
| 11 | 636562077 |
| 12 | 3710155681 |
| 13 | 21624372013 |
| 14 | 126036076401 |
| 15 | 734592086397 |
| 16 | 4281516441985 |
| 17 | 24954506565517 |
| 18 | 145445522951121 |
| 19 | 847718631141213 |
| 20 | 4940866263896161 |
| 21 | 28797478952235757 |
| 22 | 167844007449518385 |
| 23 | 978266565744874557 |
| 24 | 5701755387019728961 |
| 25 | 33232265756373499213 |