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 | 7 |
| 2 | 49 |
| 3 | 343 |
| 4 | 2370 |
| 5 | 16218 |
| 6 | 110099 |
| 7 | 742487 |
| 8 | 4979260 |
| 9 | 33232924 |
| 10 | 220896016 |
| 11 | 1463045800 |
| 12 | 9659912834 |
| 13 | 63605763734 |
| 14 | 417796855262 |
| 15 | 2738396932202 |
| 16 | 17913923467256 |
| 17 | 116986307701928 |
| 18 | 762789970679730 |
| 19 | 4966685787053850 |
| 20 | 32298201110078751 |