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) |
|---|---|
| 4 | 8321 |
| 5 | 90751 |
| 6 | 983401 |
| 7 | 9995671 |
| 8 | 99789673 |
| 9 | 999828727 |
| 10 | 9998721001 |
| 11 | 99973476433 |
| 12 | 999855751441 |
| 13 | 9998974546471 |
| 14 | 99999760517281 |
| 15 | 999985147456681 |
| 16 | 9999952887414577 |
| 17 | 99999984319096601 |
| 18 | 999999916795882627 |
| 19 | 9999999995077192591 |