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 | 4 |
| 1 | 49 |
| 2 | 544 |
| 3 | 5989 |
| 4 | 65884 |
| 5 | 724729 |
| 6 | 7972024 |
| 7 | 87692269 |
| 8 | 964614964 |
| 9 | 10610764609 |
| 10 | 116718410704 |
| 11 | 1283902517749 |
| 12 | 14122927695244 |
| 13 | 155352204647689 |
| 14 | 1708874251124584 |
| 15 | 18797616762370429 |
| 16 | 206773784386074724 |
| 17 | 2274511628246821969 |
| 18 | 25019627910715041664 |
| 19 | 275215907017865458309 |