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 | -3 |
| 2 | -5 |
| 3 | -5 |
| 4 | 25 |
| 5 | 271 |
| 6 | 1825 |
| 7 | 10735 |
| 8 | 59425 |
| 9 | 318271 |
| 10 | 1670785 |
| 11 | 8656975 |
| 12 | 44454625 |
| 13 | 226827871 |
| 14 | 1151991745 |
| 15 | 5830280815 |
| 16 | 29429454625 |
| 17 | 148249811071 |
| 18 | 745630312705 |
| 19 | 3745590106255 |
| 20 | 18797445635425 |
| 21 | 94264432179871 |
| 22 | 472428649241665 |