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 | 21 |
| 2 | 1929 |
| 3 | 111360 |
| 4 | 5493524 |
| 5 | 235936139 |
| 6 | 9260866349 |
| 7 | 343715004510 |
| 8 | 12272026383150 |
| 9 | 425379224031883 |
| 10 | 14398776122175869 |
| 11 | 477992611490969866 |
| 12 | 15612642461993689686 |
| 13 | 503019559474972734241 |
| 14 | 16017949107881110650889 |