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 | 53 |
| 3 | 510 |
| 4 | 5047 |
| 5 | 50279 |
| 6 | 501844 |
| 7 | 5012809 |
| 8 | 50094049 |
| 9 | 500720912 |
| 10 | 5005703554 |
| 11 | 50046261712 |
| 12 | 500382762350 |
| 13 | 5003219541311 |
| 14 | 50027458290511 |
| 15 | 500236958622730 |
| 16 | 5002065769284422 |
| 17 | 50018168989895296 |
| 18 | 500161047150051653 |
| 19 | 5001437349858735047 |
| 20 | 50012907314623137795 |
| 21 | 500116546694296773760 |