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 | 0 |
| 2 | 13 |
| 3 | 27 |
| 4 | 2953 |
| 5 | 24360 |
| 6 | 972080 |
| 7 | 13049563 |
| 8 | 360783593 |
| 9 | 6044482889 |
| 10 | 142205412782 |
| 11 | 2645920282312 |
| 12 | 57787769198498 |
| 13 | 1130122135817708 |
| 14 | 23838761889677477 |
| 15 | 477334902804794530 |
| 16 | 9905649696435264827 |
| 17 | 200572437515846530901 |
| 18 | 4130348948437378850158 |