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 | 2047 |
| 5 | 15841 |
| 6 | 104653 |
| 7 | 1004653 |
| 8 | 10323769 |
| 9 | 100463443 |
| 10 | 1002261781 |
| 11 | 10000321321 |
| 12 | 100004790097 |
| 13 | 1000002977551 |
| 14 | 10000130243671 |
| 15 | 100002236680837 |
| 16 | 1000003918690669 |
| 17 | 10000008250001701 |
| 18 | 100000150553089531 |
| 19 | 1000000274500018837 |
| 20 | 10000003599249373469 |