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 | 4 |
| 2 | 48 |
| 3 | 492 |
| 4 | 4936 |
| 5 | 49380 |
| 6 | 493824 |
| 7 | 4938268 |
| 8 | 49382712 |
| 9 | 493827156 |
| 10 | 4938271600 |
| 11 | 49382716044 |
| 12 | 493827160488 |
| 13 | 4938271604932 |
| 14 | 49382716049376 |
| 15 | 493827160493820 |
| 16 | 4938271604938264 |
| 17 | 49382716049382708 |
| 18 | 493827160493827152 |
| 19 | 4938271604938271596 |
| 20 | 49382716049382716040 |
| 21 | 493827160493827160484 |