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 | 4 |
| 1 | 52 |
| 2 | 140452 |
| 3 | 2770663499604052 |
| 4 | 21269209556953516583554114034636483645584976452 |