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 | 1 |
| 1 | 4 |
| 2 | 29 |
| 3 | 286 |
| 4 | 3511 |
| 5 | 51668 |
| 6 | 888889 |
| 7 | 17538454 |
| 8 | 390892451 |
| 9 | 9720791092 |
| 10 | 267004296901 |
| 11 | 8031916155134 |
| 12 | 262709978263279 |
| 13 | 9285541905849316 |
| 14 | 352765522430193905 |
| 15 | 14337731083770642838 |
| 16 | 620867368421052631579 |