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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 121 |
| 6 | 484 |
| 7 | 1089 |
| 8 | 9801 |
| 9 | 10201 |
| 10 | 12321 |
| 11 | 14641 |
| 12 | 40804 |
| 13 | 44944 |
| 14 | 1002001 |
| 15 | 1234321 |
| 16 | 4008004 |
| 17 | 100020001 |
| 18 | 102030201 |
| 19 | 104060401 |
| 20 | 121242121 |
| 21 | 123454321 |
| 22 | 125686521 |
| 23 | 400080004 |
| 24 | 404090404 |
| 25 | 10000200001 |
| 26 | 10221412201 |
| 27 | 12102420121 |
| 28 | 12345654321 |
| 29 | 40000800004 |
| 30 | 1000002000001 |