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 | 5 |
| 2 | 17 |
| 3 | 53 |
| 4 | 4373 |
| 5 | 13121 |
| 6 | 1062881 |
| 7 | 6973568801 |
| 8 | 188286357653 |
| 9 | 15251194969973 |
| 10 | 100063090197999413 |
| 11 | 1046695266054721074427023041 |
| 12 | 763040848953891663257299797617 |
| 13 | 556256778887387022514571552463521 |