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 | 2 |
| 2 | 13 |
| 3 | 107 |
| 4 | 1009 |
| 5 | 10037 |
| 6 | 100049 |
| 7 | 1000099 |
| 8 | 10000379 |
| 9 | 100000399 |
| 10 | 1000000787 |
| 11 | 10000000799 |
| 12 | 100000001989 |
| 13 | 1000000001999 |
| 14 | 10000000003999 |
| 15 | 100000000006997 |
| 16 | 1000000000017899 |
| 17 | 10000000000018999 |
| 18 | 100000000000038989 |
| 19 | 1000000000000067999 |
| 20 | 10000000000000079899 |
| 21 | 100000000000000079999 |