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 | 81 |
| 2 | 8241 |
| 3 | 9801 |
| 4 | 538276 |
| 5 | 998001 |
| 6 | 77837025 |
| 7 | 99980001 |
| 8 | 7922547264 |
| 9 | 8643251344 |
| 10 | 9223797609 |
| 11 | 9999800001 |
| 12 | 106710893289 |
| 13 | 453378226756 |
| 14 | 491023832064 |
| 15 | 945958034529 |
| 16 | 999998000001 |
| 17 | 11916002265169 |
| 18 | 15790977390244 |
| 19 | 24917378001936 |
| 20 | 25082758752025 |
| 21 | 36315251812569 |