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 | 5 |
| 1 | 25 |
| 2 | 165 |
| 3 | 1225 |
| 4 | 9669 |
| 5 | 79225 |
| 6 | 665445 |
| 7 | 5686825 |
| 8 | 49208709 |
| 9 | 429746905 |
| 10 | 3779084325 |
| 11 | 33407391625 |
| 12 | 296515495749 |
| 13 | 2639977136185 |
| 14 | 23561123826405 |
| 15 | 210669225531625 |
| 16 | 1886405750358789 |
| 17 | 16910575282247065 |
| 18 | 151726863979595685 |