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) |
|---|---|
| 2 | 25 |
| 3 | 225 |
| 4 | 2025 |
| 5 | 20164 |
| 6 | 200704 |
| 7 | 2002225 |
| 8 | 20007729 |
| 9 | 200024449 |
| 10 | 2000057284 |
| 11 | 20000182084 |
| 12 | 200000361796 |
| 13 | 2000001237796 |
| 14 | 20000000402496 |
| 15 | 200000010642496 |
| 16 | 2000000040249600 |
| 17 | 20000000215721449 |
| 18 | 200000000447251216 |