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 | 1 |
| 2 | 11 |
| 3 | 126 |
| 4 | 753 |
| 5 | 1923 |
| 6 | 32183 |
| 7 | 134708 |
| 8 | 1487139 |
| 9 | 23908603 |
| 10 | 215443469 |
| 11 | 106917811 |
| 12 | 15056809703 |
| 13 | 27354803113 |
| 14 | 681048619195 |
| 15 | 361160395301 |