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 | 247 |
| 4 | 1383 |
| 5 | 7722 |
| 6 | 42712 |
| 7 | 237116 |
| 8 | 1315783 |
| 9 | 7300042 |
| 10 | 40505756 |
| 11 | 224748056 |
| 12 | 1247024929 |
| 13 | 6919195733 |
| 14 | 38391539384 |
| 15 | 213017628693 |
| 16 | 1181940415631 |
| 17 | 6558063227535 |
| 18 | 36387785244039 |
| 19 | 201899687047572 |
| 20 | 1120251845376251 |