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 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 25 |
| 5 | 65 |
| 6 | 325 |
| 7 | 1105 |
| 8 | 4225 |
| 9 | 5525 |
| 10 | 27625 |
| 11 | 71825 |
| 12 | 138125 |
| 13 | 160225 |
| 14 | 801125 |
| 15 | 2082925 |
| 16 | 4005625 |
| 17 | 5928325 |
| 18 | 29641625 |
| 19 | 77068225 |
| 20 | 148208125 |
| 21 | 243061325 |
| 22 | 1215306625 |
| 23 | 3159797225 |
| 24 | 6076533125 |
| 25 | 12882250225 |
| 26 | 53716552825 |
| 27 | 64411251125 |