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 | 21 |
| 3 | 176 |
| 4 | 936 |
| 5 | 3750 |
| 6 | 12342 |
| 7 | 35112 |
| 8 | 89232 |
| 9 | 207207 |
| 10 | 446875 |
| 11 | 906048 |
| 12 | 1743248 |
| 13 | 3206268 |
| 14 | 5670588 |
| 15 | 9690000 |
| 16 | 16062144 |
| 17 | 25912029 |
| 18 | 40797009 |
| 19 | 62837104 |
| 20 | 94875000 |
| 21 | 140670530 |
| 22 | 205134930 |
| 23 | 294610680 |
| 24 | 417203280 |
| 25 | 583171875 |
| 26 | 805386231 |