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 | 5 |
| 2 | 75 |
| 3 | 235 |
| 4 | 745 |
| 5 | 22485 |
| 6 | 22925 |
| 7 | 235065 |
| 8 | 505525 |
| 9 | 2356384 |
| 10 | 23569166 |
| 11 | 227069495 |
| 12 | 674919666 |
| 13 | 3931354166 |
| 14 | 7450205075 |
| 15 | 39969432765 |
| 16 | 524933839166 |
| 17 | 2134374738666 |
| 18 | 4904646324166 |
| 19 | 23802428354166 |
| 20 | 159861050770834 |
| 21 | 725227930760773 |
| 22 | 1882963768916666 |
| 23 | 7586668936732745 |
| 24 | 74536940878685015 |
| 25 | 174801474694453186 |