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 | 19 |
| 2 | 361 |
| 3 | 1995 |
| 4 | 17119 |
| 5 | 123709 |
| 6 | 955073 |
| 7 | 7184755 |
| 8 | 54606513 |
| 9 | 413322903 |
| 10 | 3133722193 |
| 11 | 23742848381 |
| 12 | 179940784609 |
| 13 | 1363558911785 |
| 14 | 10333337050839 |
| 15 | 78306467535059 |
| 16 | 593415477442647 |
| 17 | 4496952127639277 |
| 18 | 34078343213807171 |
| 19 | 258248804284088975 |