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 | 5 |
| 1 | 16 |
| 2 | 37 |
| 3 | 127 |
| 4 | 1307 |
| 5 | 4048 |
| 6 | 9403 |
| 7 | 32257 |
| 8 | 331973 |
| 9 | 1028176 |
| 10 | 2388325 |
| 11 | 8193151 |
| 12 | 84319835 |
| 13 | 261152656 |
| 14 | 606625147 |
| 15 | 2081028097 |
| 16 | 21416906117 |
| 17 | 66331746448 |
| 18 | 154080399013 |
| 19 | 528572943487 |
| 20 | 5439809833883 |
| 21 | 16848002445136 |