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 | 25 |
| 2 | 625 |
| 3 | 3969 |
| 4 | 19881 |
| 5 | 87025 |
| 6 | 314721 |
| 7 | 1113025 |
| 8 | 3674889 |
| 9 | 11758041 |
| 10 | 37222201 |
| 11 | 115369081 |
| 12 | 356794321 |
| 13 | 1097663161 |
| 14 | 3366900625 |
| 15 | 10334958921 |
| 16 | 31687204081 |
| 17 | 97226099721 |
| 18 | 298466635041 |
| 19 | 916505619649 |
| 20 | 2816291468761 |
| 21 | 8656864485025 |