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 | 21 |
| 2 | 441 |
| 3 | 5357 |
| 4 | 60215 |
| 5 | 738031 |
| 6 | 9260851 |
| 7 | 114928827 |
| 8 | 1418719059 |
| 9 | 17534258973 |
| 10 | 216934553467 |
| 11 | 2683742012463 |
| 12 | 33195135531017 |
| 13 | 410584897617051 |
| 14 | 5078597128434733 |
| 15 | 62818418192287393 |
| 16 | 777013463038269315 |