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 | 1 |
| 2 | 5 |
| 3 | 73 |
| 4 | 4301 |
| 5 | 1065361 |
| 6 | 1079026325 |
| 7 | 4404504773593 |
| 8 | 72088402948928861 |
| 9 | 4722943066827454121761 |
| 10 | 1237982543178169058402322725 |
| 11 | 1298086594246614900499652230482793 |
| 12 | 5444532149619463867564918804810528611821 |
| 13 | 91343917667481554378430257939829428893551284401 |