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 | 5 |
| 3 | 41 |
| 4 | 67 |
| 5 | 109 |
| 6 | 1973 |
| 7 | 5167 |
| 8 | 2692537 |
| 9 | 11405773 |
| 10 | 126491971 |
| 11 | 331160281 |
| 12 | 535828591 |
| 13 | 279167724889 |
| 14 | 145446920496281 |
| 15 | 28944668049352441 |
| 16 | 5760134388741632239 |
| 17 | 63880869269980199809 |
| 18 | 167242286979696845953 |
| 19 | 597222253637954133837103 |