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 | 5 |
| 2 | 341 |
| 3 | 7381 |
| 4 | 69905 |
| 5 | 406901 |
| 6 | 1727605 |
| 7 | 5884901 |
| 8 | 17043521 |
| 9 | 43584805 |
| 10 | 101010101 |
| 11 | 216145205 |
| 12 | 432988561 |
| 13 | 820586261 |
| 14 | 1483357205 |
| 15 | 2574332101 |
| 16 | 4311810305 |
| 17 | 6999978821 |
| 18 | 11054078101 |
| 19 | 17030739605 |
| 20 | 25664160401 |
| 21 | 37908820405 |
| 22 | 54989488181 |
| 23 | 78459301541 |
| 24 | 110266749505 |
| 25 | 152832422501 |