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 | 6 |
| 2 | 36 |
| 3 | 236 |
| 4 | 1686 |
| 5 | 13028 |
| 6 | 108078 |
| 7 | 956348 |
| 8 | 8976708 |
| 9 | 88962160 |
| 10 | 927129786 |
| 11 | 10125636716 |
| 12 | 115543526476 |
| 13 | 1373933166848 |
| 14 | 16985192456410 |
| 15 | 217851008508220 |
| 16 | 2893517713599370 |
| 17 | 39732264695056772 |
| 18 | 563187218351672330 |
| 19 | 8229159647194683140 |
| 20 | 123795221970087313340 |