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 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 325 |
| 5 | 1625 |
| 6 | 1105 |
| 7 | 5525 |
| 8 | 27625 |
| 9 | 160225 |
| 10 | 1022125 |
| 11 | 801125 |
| 12 | 5928325 |
| 13 | 8491925 |
| 14 | 29641625 |
| 15 | 42459625 |
| 16 | 444215525 |
| 17 | 314201225 |
| 18 | 2003613625 |
| 19 | 1571006125 |
| 20 | 14826740825 |
| 21 | 12882250225 |
| 22 | 127081657625 |
| 23 | 64411251125 |
| 24 | 88717383625 |