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 | 21 |
| 2 | 749 |
| 3 | 3937 |
| 4 | 43308 |
| 5 | 2250982 |
| 6 | 11512566 |
| 7 | 3558888 |
| 8 | 473983329 |
| 9 | 4102010820 |
| 10 | 3773723044 |
| 11 | 16952125989 |
| 12 | 322374164226 |
| 13 | 702125798925 |
| 14 | 118364239437 |
| 15 | 7609460886830 |
| 16 | 38642046123073 |
| 17 | 22788500587323 |
| 18 | 61246570410530 |