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 | 4 |
| 3 | 253 |
| 4 | 351 |
| 5 | 2849 |
| 6 | 15747 |
| 7 | 15996 |
| 8 | 1039997 |
| 9 | 1436799 |
| 10 | 11676801 |
| 11 | 64528003 |
| 12 | 65552004 |
| 13 | 4261904253 |
| 14 | 5888003551 |
| 15 | 47851526049 |
| 16 | 264435743747 |
| 17 | 268632095996 |
| 18 | 17465282591997 |
| 19 | 24129037113599 |
| 20 | 196095542073601 |
| 21 | 1083657613344003 |
| 22 | 1100854263840004 |