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 | 11 |
| 2 | 71 |
| 3 | 431 |
| 4 | 2591 |
| 5 | 15551 |
| 6 | 4353564671 |
| 7 | 5642219814911 |
| 8 | 341163456359156416511 |
| 9 | 2046980738154938499071 |
| 10 | 20628849596981071092343898111 |
| 11 | 26734989077687468135677691953151 |
| 12 | 207891275068097752223029732627709951 |
| 13 | 269427092488254686881046533485512097791 |