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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 27 |
| 4 | 156 |
| 5 | 925 |
| 6 | 5427 |
| 7 | 31812 |
| 8 | 186485 |
| 9 | 1094211 |
| 10 | 6428346 |
| 11 | 37817163 |
| 12 | 222778629 |
| 13 | 1314116799 |
| 14 | 7761414055 |
| 15 | 45894511305 |
| 16 | 271681161390 |
| 17 | 1609919112321 |
| 18 | 9549113626206 |
| 19 | 56690129330346 |
| 20 | 336829717243428 |