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 | 3 |
| 2 | 19 |
| 3 | 4099 |
| 4 | 65539 |
| 5 | 234259 |
| 6 | 456979 |
| 7 | 614659 |
| 8 | 1336339 |
| 9 | 3748099 |
| 10 | 14776339 |
| 11 | 21381379 |
| 12 | 33362179 |
| 13 | 45212179 |
| 14 | 71639299 |
| 15 | 116985859 |
| 16 | 146410003 |
| 17 | 193877779 |
| 18 | 268435459 |
| 19 | 322417939 |
| 20 | 759333139 |
| 21 | 1146228739 |
| 22 | 1664966419 |
| 23 | 2019963139 |