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 | 225 |
| 2 | 5625 |
| 3 | 5405625 |
| 4 | 23765625 |
| 5 | 2127515625 |
| 6 | 58503515625 |
| 7 | 51921031640625 |
| 8 | 250727431640625 |
| 9 | 20090404775390625 |
| 10 | 608180644775390625 |
| 11 | 498431438615478515625 |
| 12 | 2642208974615478515625 |
| 13 | 189450791534674072265625 |
| 14 | 6319494849134674072265625 |
| 15 | 9981411957966851806640625 |