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 | 13 |
| 2 | 161 |
| 3 | 606 |
| 4 | 6433 |
| 5 | 39916 |
| 6 | 341011 |
| 7 | 2399000 |
| 8 | 18334295 |
| 9 | 130350889 |
| 10 | 947356115 |
| 11 | 6693133584 |
| 12 | 47588393713 |
| 13 | 334543874696 |
| 14 | 2356688545513 |
| 15 | 16526137384381 |
| 16 | 115977271626785 |
| 17 | 812415242570854 |
| 18 | 5692700008978435 |
| 19 | 39860063264311589 |