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 | 3 |
| 1 | 5 |
| 2 | 51 |
| 3 | 53 |
| 4 | 140451 |
| 5 | 140453 |
| 6 | 2770663499604051 |
| 7 | 2770663499604053 |
| 8 | 21269209556953516583554114034636483645584976451 |
| 9 | 21269209556953516583554114034636483645584976453 |