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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 99 |
| 3 | 11259 |
| 4 | 3052323 |
| 5 | 1620265923 |
| 6 | 1488257158851 |
| 7 | 2172534146099019 |
| 8 | 4736552519729393091 |
| 9 | 14708695606607601165843 |
| 10 | 62671742039942099631403299 |
| 11 | 355493170380387030721038571419 |
| 12 | 2618304731622723256262677112102883 |
| 13 | 24521387779014982719407393681918617443 |