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 | 0 |
| 2 | 1 |
| 3 | 17 |
| 4 | 315 |
| 5 | 316 |
| 6 | 5623 |
| 7 | 99999 |
| 8 | 100000 |
| 9 | 1778279 |
| 10 | 31622776 |
| 11 | 562341324 |
| 12 | 562341325 |
| 13 | 9999999999 |
| 14 | 10000000000 |
| 15 | 177827941003 |
| 16 | 3162277660168 |
| 17 | 56234132519034 |
| 18 | 999999999999999 |
| 19 | 1000000000000000 |
| 20 | 17782794100389227 |
| 21 | 17782794100389228 |
| 22 | 316227766016837932 |
| 23 | 316227766016837933 |